Mercedes-Benz SLS AMG GT Roadster (R197) Tuning Guide 2026 — Body Kits, Wheels & Performance
The Mercedes-Benz SLS AMG GT Roadster (chassis code R197) is the soft-top sister of the gullwing SLS Coupe and arguably the most emotional front-mid-engined grand tourer Affalterbach has ever signed off. Built between 2011 and 2014 on AMG's in-house aluminium spaceframe with a transaxle layout, powered by the hand-assembled M159 6.2-litre naturally aspirated V8 producing 591 hp and 650 Nm in GT specification, and topped with a three-layer fabric soft top that cycles in 11 seconds at up to 50 km/h — the R197 is a designed-and-built-in-Affalterbach object, not a rebadged production-car spinoff. This guide covers every meaningful upgrade available for the SLS AMG GT Roadster — body kits from Brabus, Mansory Cormeum, FAB Design Jetstream, Hamann Hawk, Inden Design and RevoZport, forged 20" and 21" wheels, the genuinely radical RENNtech RS-700 supercharger conversion, the Brabus 700 Biturbo twin-turbo programme, the Mcchip-DKR naturally-aspirated 615 hp route, interior leatherwork and a concrete step-by-step walkthrough of how a real Hodoor R197 build is delivered, week by week.
Mercedes-Benz SLS AMG GT Roadster (R197) — Key Specifications
Platform Overview — Why the R197 Tunes Like Nothing Else in the Mercedes Catalogue
The SLS AMG Roadster is an unusual vehicle in the Mercedes family tree because it did not start life as a production-Mercedes spinoff. It was designed and engineered inside AMG Affalterbach, on an aluminium spaceframe that shares nothing meaningful with any E-Class, S-Class or SL platform, with a front-mid-mounted naturally aspirated V8 driving the rear wheels through a rear-mounted 7-speed dual-clutch transaxle. That layout — engine ahead of the firewall but behind the front axle, gearbox at the rear — is why the car's weight distribution sits at a near-perfect 47:53 front-to-rear, and why the chassis responds to driver inputs in a way far closer to a Ferrari 599 GTB or a Porsche 911 GT3 than to anything else Stuttgart builds. Practically for tuning purposes this matters in three ways. First, parts catalogues are small — the SLS was built in limited numbers (roughly 13,000 cars worldwide across coupe, Roadster, GT and Black Series combined) so aftermarket programmes are specialist rather than mass-market, and prices reflect that. Second, the M159 6.2-litre V8 is a hand-assembled naturally aspirated engine with individual throttle bodies, a dry sump and a 7200 rpm redline — it responds extraordinarily well to pure NA work (cams, headers, ECU, intake) up to about 615 hp, but any serious power step beyond that requires forced induction, which is where the Brabus Biturbo and RENNtech supercharger conversions come in. Third, the soft top on the Roadster imposes genuine clearance constraints on any body-kit work that widens the rear haunches — the fabric-top stack has to clear the upper rear-quarter panel shape, so widebody programmes for the R197 Roadster are specifically engineered differently from those for the C197 Coupe. Every reputable tuner listed below knows this; many lesser ones don't.
Body Kits — Brabus, Mansory Cormeum, FAB Design Jetstream, Hamann Hawk, Inden Design, RevoZport
Brabus SLS AMG programme. Brabus's R197 programme is the benchmark for understated Affalterbach-style upgrades — a carbon front spoiler with integrated day-running-light reshape, carbon side-skirt extensions, a carbon rear diffuser with integrated quad Brabus exhaust exits, boot-lid lip spoiler and carbon mirror caps. Unlike Mansory or FAB Design, Brabus deliberately keeps the car's factory silhouette intact: no fender flares, no reshaped bonnet, no roof scoop. The result reads as a factory special-edition rather than an aftermarket conversion. Full carbon spec at Bottrop runs £22,000–32,000 installed; TÜV and ECE approved for EU registration. Popular across Germany, UK, Switzerland and Singapore.
Mansory Cormeum. The Cormeum is Mansory's full R197 widebody programme — flared front and rear fenders adding approximately 20 mm per side, a reshaped carbon front apron with enlarged intakes, a full carbon bonnet with central air outlet, aggressive side-sill sculpting, a carbon roof panel option (coupe only — not fitted to Roadster), a rear diffuser, raised ducktail boot spoiler and quad-stacked carbon exhaust tips. Cormeum for the Roadster has been specifically engineered around the soft-top mechanism clearance — Mansory validates top-cycling with the kit fitted before shipment. Full Cormeum carbon spec lands at £85,000–130,000 and is the peak of R197 dramatic transformation. Very popular across Dubai, Moscow, Miami and Doha.
FAB Design Jetstream. Swiss-engineered Jetstream body kit is the longest-established aftermarket R197 programme after Brabus — a full composite package including front spoiler, side skirts, rear diffuser and an integrated trunk lid with ducktail. FAB Design uses a lighter, more flowing carbon silhouette than Mansory's muscular Cormeum — often chosen by clients who want transformation without aggression. Kit price £28,000–45,000 depending on carbon content; a popular pick across Switzerland, Germany and the Benelux.
Hamann Hawk. Hamann's R197 Hawk programme is a widebody conversion with dedicated 666 hp engine work (ECU and exhaust). Widebody fenders add 40 mm per side rear and 30 mm per side front; the front apron is redesigned with full-width carbon splitter, side-sills integrate the flared-fender transitions, and a bold carbon rear wing replaces the factory ducktail. Complete Hawk programme with mechanical upgrades £55,000–80,000. A very recognisable and muscular build; popular across GCC markets and in the UK modified-car scene.
Inden Design and RevoZport. Inden Design offers a more subtle R197 programme — front-lip carbon spoiler, side-sill extensions and trunk-lid ducktail — typically £12,000–18,000 and favoured by owners who want a non-widebody aesthetic refresh. RevoZport's Raze R197 programme uses autoclaved pre-preg carbon for front spoiler, diffuser and trunk-lip — competitive on build quality with Brabus at materially lower cost (£8,000–14,000) and well-regarded in Asian and Australian markets.
Wheels — Brabus Monoblock F, HRE P200, ADV.1 ADV5.2, Vossen Forged, OZ Racing Superforgiata
Factory R197 wheels are 19" front and 20" rear forged aluminium — already decent, but visually slightly lost in the Roadster's wide-hipped shape. For a full aesthetic upgrade we recommend stepping to 20" front / 21" rear in genuine forged construction. Under the M159's 650 Nm and the long suspension arms of the SLS, cast wheels are genuinely marginal; forged is the only correct specification.
Brabus Monoblock F. The signature Brabus R197 wheel. 20 × 9.0J ET45 front and 21 × 11.0J ET42 rear with 265/30 ZR20 front and 325/25 ZR21 rear Michelin Pilot Sport Cup 2 or Pilot Sport 4S. Forged from 6061-T6 billet, available in Platinum Edition, satin black, liquid-titanium, gloss black and bespoke two-tone. Also available in 20" front / 20" rear dished concave for a more classic stance. Monoblock R (reverse-spoke) and Monoblock S (multi-spoke concave) are alternative Brabus patterns on the same forged base.
HRE P200 / P101 Series. American multi-piece forged — 20 × 9.0J ET45 front, 21 × 11.0J ET42 rear, with unrestricted finish and colour customisation on centre disc, lip and hardware. Typical 8–10 week lead time. The standard pick for R197 owners who want a finish specification outside the Brabus catalogue, for example colour-matched to a PPG bespoke paint.
ADV.1 ADV5.2 MV2. Miami-based ADV.1's concave multi-spoke pairs extremely well with Mansory Cormeum or Hamann Hawk widebody kits. 20" or 21" specifications. Premium pricing (£15,000+ for a forged set of four) with 10–14-week lead time.
Vossen Forged S21-01 / OZ Racing Superforgiata. Vossen's forged series and OZ Racing's Superforgiata are both clean multi-spoke classic silhouettes well-matched to un-widebody builds with Brabus or Inden Design kits. Forged construction, 20/21" sizes, comparable pricing to HRE. Whichever wheel pattern is chosen, the two hard rules for the R197 remain: genuine forged only, and keep to 20" front / 21" rear to preserve factory ride height and avoid arch clearance issues with full suspension compression at speed.
Performance — Brabus 700 Biturbo, RENNtech RS-700 Supercharger, Mcchip-DKR NA, Akrapovic, Weistec
Mcchip-DKR naturally aspirated 615 hp programme. The lightest-touch meaningful upgrade on the M159 — revised ECU calibration, high-flow carbon airbox, 200-cell sport-catalyst headers, revised exhaust and throttle-body rework. The result is 615 hp and 690 Nm, retaining the naturally-aspirated character and linear throttle response that is the single most distinctive thing about the SLS. Turnkey at approximately £8,500–12,500 at Mcchip's Aachen facility. The correct pick for owners who want more power without losing the NA soundtrack.
RENNtech RS-700 supercharger conversion. Florida-based RENNtech's headline R197 programme — a twin-screw supercharger bolted to the M159, with bespoke intake, revised ECU, upgraded fuel system and stainless-steel midpipes. Delivered output is approximately 700 hp and 820 Nm with an aggressive torque curve from 3000 rpm. Complete installation including supercharger hardware, programming, fuel system and exhaust — approximately $55,000–70,000 USD at the Lake Park, FL facility, or arranged in-country through authorised installers. Retains the M159's NA-style linear response below boost threshold. A very popular choice in the US; increasingly seen in GCC and EU markets.
Brabus 700 Biturbo. The rarest and most ambitious R197 engine programme — Brabus convert the M159 to twin-turbocharged configuration with bespoke exhaust manifolds, twin turbochargers, a high-flow intake, revised fuel system and full ECU recalibration. Output is 700 hp and 800 Nm. Only a small number of 700 Biturbo SLS cars were built; pricing for the full programme starts around £110,000 installed at Bottrop. Not commonly specified; the RENNtech RS-700 is the more frequently chosen route to 700 hp on the R197.
Weistec supercharger. California's Weistec also offers a twin-screw supercharger programme for the M159, delivering approximately 720 hp with bespoke intake and fuel-system work, typically $48,000–62,000 USD. A popular US-market alternative to RENNtech with a slightly different intercooler design.
Exhausts. The Akrapovic Evolution titanium full-length system with carbon tailpipes is the benchmark — approximately 15 kg lighter than factory, materially more emotive exhaust note, typically £9,500–12,500 installed. Capristo offers a valved exhaust with remote wireless control that allows seat-of-the-moment switching between quiet touring and full-shout throttle. Both retain the factory rear bumper aperture positions and are cleanly reversible before resale. Kline Innovation offers a particularly aggressive-sounding titanium system for owners who want maximum noise; a British and Swiss-market favourite.
Brakes and suspension. Factory R197 brakes — 390 mm front and 360 mm rear steel rotors with 6-piston fixed callipers — are adequate for road use and Stage 1 power levels. With the RS-700 supercharger or above we recommend the factory AMG carbon-ceramic brake option (402 mm front, 360 mm rear) retrofitted from a donor car, or aftermarket equivalents from Brembo GT-R or PowerBrake. Suspension upgrades focus on KW Variant 3 or Öhlins Road & Track coilover sets — sharper turn-in and better control of the long front overhang, while retaining meaningful road usability.
Interior — Brabus Fine Leather, Vilner, Carlex Design, Carbon & Alcantara Trim
The factory R197 cabin is already elevated — Nappa leather, contrast stitching, aluminium and piano-black trim — but on a full-build tuned Roadster it deserves dedicated work. Brabus Fine Leather offers full re-trim in any Nappa or semi-aniline hide with diamond-quilted seat centres, bespoke Brabus-logo embroidery and optional alcantara on headliner and door inserts — approximately £20,000–32,000 at Bottrop. Vilner in Bulgaria and Carlex Design in Poland deliver equivalent craftsmanship at roughly 35–45% less, and are the standard choice for UK, German and GCC builds. Carbon-fibre replacement of dashboard, centre console, door inserts and steering wheel rim complete the build; alcantara headlining is a particularly transformative upgrade on the Roadster.
How an Order Works — An SLS AMG GT Roadster Build, Week by Week
A real R197 build rarely feels routine, so rather than pitch in abstracts let me walk you through a live order that closed recently. The customer was a GCC-based collector in his early forties who had bought a 2013 SLS AMG GT Roadster in Designo Magno Alanite Grey — a matte tri-coat — and wanted to push the car to roughly 700 hp without losing its soft-top usability. Week one, enquiry landed by email with five photos and a VIN; within 36 hours we returned a fitment check confirming Brabus widebody programme and RENNtech RS-700 supercharger compatibility on Final-Edition-spec GT Roadsters, plus a preliminary quote. Week two, specification lock — Brabus rear-haunch widebody (carefully engineered to clear the soft-top stack), RENNtech RS-700 supercharger, Brabus Monoblock F 20"/21" forged wheels in satin black, Akrapovic Evolution titanium exhaust and KW Variant 3 coilovers. Deposit received, orders triggered with Bottrop, RENNtech Florida and Akrapovic Slovenia in parallel. Weeks three to seven, parts manufactured and shipped: Brabus carbon panels air-freighted from Affalterbach, RENNtech supercharger kit dispatched from Lake Park, wheels forged and finished. Week eight, car into Bottrop for Brabus fitment; the Designo Magno Alanite Grey tri-coat needed a controlled respray on the rear quarters — matte finishes on tri-coat base do not tolerate localised touch-up so both rear panels were re-sprayed. Week nine, RENNtech RS-700 installation with programming and dyno validation. Week ten, soft-top full-cycle test with the widened rear haunches — passed with 4 mm clearance at the tightest point — and white-glove ship to the customer. Ten weeks, end-to-end, £186,000 total invoice including VAT and freight. That is how an R197 build actually runs.
Frequently Asked Questions
SLS AMG GT Roadster versus the SLS Coupe and AMG GT C190 — what's actually different?
Three separate cars, easy to confuse. The SLS AMG Coupe (C197) is the gullwing-door original, built 2010–2014, same M159 V8, same transaxle, same aluminium spaceframe. The SLS AMG GT Roadster (R197) is the fabric-soft-top sister, 2011–2014, regular front-hinged doors (the gullwing mechanism could not be retained on a roofless chassis), same 591 hp GT powertrain. Both cars were replaced by the entirely different AMG GT (C190) from 2015 — a new smaller aluminium spaceframe, the M178 4.0-litre twin-turbo V8 (462–730 hp depending on variant), shorter wheelbase, lower price point. C190 is the car most often confused with the R197 in aftermarket listings; parts and body kits developed for the C190 do not fit the R197 in any meaningful way. Always confirm chassis code — R197 for the Roadster, C197 for the gullwing Coupe, C190 for the 2015+ AMG GT — before committing to any body-kit or mechanical programme.
Is the RENNtech RS-700 supercharger safe long-term on the M159?
Yes, when properly maintained. The M159 is a robust naturally-aspirated engine with generous headroom — forged internals, dry-sump oiling, a strong bottom end — and it has been supercharged (RENNtech, Weistec) and twin-turbocharged (Brabus) for over a decade with well-documented longevity. RENNtech specify 98 RON premium fuel only, a shortened oil-change interval (5,000 km rather than factory 10,000), and annual supercharger belt and intercooler inspection. Treated correctly, RS-700-equipped cars routinely run past 100,000 km without engine intervention. The pitfalls are neglect rather than engineering: under-specification fuel, extended oil intervals, track abuse without intercooler cooldown. If the car is a daily or a touring grand-tourer and the owner maintains it to the RENNtech schedule, the RS-700 is genuinely a safe long-term upgrade.
Can you fit a widebody kit without compromising the soft top's operation?
Yes, but only with programmes specifically engineered for the R197 Roadster. The fabric soft-top mechanism cycles through a defined path between the rear bulkhead, the upper rear-quarter panel shape and the boot-lid, and any body-kit work that widens the rear haunches has to preserve that path exactly. Brabus's and Mansory's R197 Roadster-specific programmes are engineered and validated for full roof cycling; FAB Design Jetstream and Hamann Hawk also offer Roadster-specific fitments. Kits that were originally engineered only for the C197 Coupe — and there are several cheap-end aftermarket options that fall into this category — can jam or abrade the soft-top mechanism and should be avoided. At Hodoor every R197 Roadster build includes a full soft-top cycle test as a standard pre-shipment check; tolerance is typically validated to better than 4 mm at the tightest clearance point.
What does a full R197 build cost, and how long does it take end-to-end?
Budget and timeline depend heavily on specification. A light, sensible programme — Brabus carbon aesthetics, Brabus Monoblock F wheels, Akrapovic exhaust, Mcchip-DKR NA 615 hp tune — runs approximately £55,000–75,000 installed and takes 4–6 weeks from order to delivery. A mid-spec programme adding RENNtech RS-700 supercharger, KW Variant 3 coilovers and Carlex interior re-trim typically runs £130,000–170,000 and takes 8–10 weeks. A full-blown Mansory Cormeum or Hamann Hawk widebody build with Brabus 700 Biturbo conversion, 21" ADV.1 forged wheels, full Brabus Fine Leather interior and AMG carbon-ceramic brake retrofit runs £280,000–420,000 and takes 14–18 weeks — the Cormeum and Hawk body kits alone are 8–10 week lead times before any mechanical work starts. All timelines assume the donor car is already in-country; international logistics add a further 2–4 weeks. Hodoor coordinates donor sourcing, all tuner programmes, paintwork, import compliance and white-glove delivery as a single managed programme with staged milestone payments.
