RENNtech

RENNtech Since 1989, RENNtech has evolved to be the foremost authority of Mercedes-Benz and luxury vehicle tuning and aftermarket performance products.
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RENNtech has become the premier Mercedes-Benz specialist and Hartmut Feyhl himself is regarded by many as USA’s foremost authority in Mercedes tuning. His vast experience comes from 12 years spent at AMG Germany before serving as the North American division’s Technical Director. Prior to the tuning company’s merger with Mercedes-Benz in 1999, by the request of AMG Germany, Feyhl branched out on hi

s own to start RENNtech and service the existing AMG North America customers. Performance without compromise. This is the foundation upon which we have built our reputation. Established in 1989 by Hartmut Feyhl, RENNtech has evolved and grown from servicing AMG’s customers into the foremost authority on tuning and customizing AMGs and Mercedes-Benz. RENNtech also offers tuning solutions for Porsche, Audi and Bentley vehicles, along with other European luxury cars. Over the years, we have developed high-performance products for virtually all Mercedes-Benz AMG vehicles. Some of the most notable among these are the 200 mph RENNtech E7.4RS (which claimed ‘Fastest Sedan in the World’ honors by Car and Driver Magazine in 1996) and the more recent 945 LB-FT 5.5L V8 Biturbo RENNtech R3+ Monster. Each of these vehicles are just a sampling of what RENNtech has achieved, featuring extreme performance, upgraded aesthetics and a fit and finish that rivals factory vehicles.

C63 AMG Black Series RENNtech R3 😈 with
07/14/2026

C63 AMG Black Series RENNtech R3 😈 with

The RENNtech Carbon Fiber Rear Wing and Bumperette Delete transform the rear end of the Mercedes-AMG GT with a sharper, ...
06/26/2026

The RENNtech Carbon Fiber Rear Wing and Bumperette Delete transform the rear end of the Mercedes-AMG GT with a sharper, more functional, and refined finish 🔥Developed with 3D scanning, CAD surfacing, CFD analysis, and 3D-print prototyping, the Rear Wing was engineered for uncompromised functionality and improved rear-end stability.
Each wing element is crafted in Germany using pre-preg carbon fiber for exceptional surface quality, fitment, and durability, paired with CNC-machined 6061-T6 aluminum mounting brackets and custom titanium hardware. No permanent vehicle modifications required.
Completing the look, the RENNtech Carbon Fiber Bumperette Delete removes the North American-spec bumperettes for a cleaner Euro-style rear end. Engineered and manufactured in-house by RENNtech, these inserts use pre-preg carbon fiber with a weave closely matched to AMG factory carbon fiber, installing with factory fasteners and OEM mounting points.
Finished in a high-gloss UV-protective clear coat, this rear-end upgrade delivers the quality, precision, and performance-driven design expected from RENNtech.
Fits Mercedes-AMG GT C/R 190 Series

Celebrating 140 years of Mercedes-Benz with an appreciation post for the iconic W140, and in this case the RENNtech S76R...
06/23/2026

Celebrating 140 years of Mercedes-Benz with an appreciation post for the iconic W140, and in this case the RENNtech S76R 🔥
Powered by a 7.6-liter M120 V12 engine, the S76R is one of the most powerful naturally aspirated V12 built by RENNtech (to date) and the largest displacement on record for the Mercedes-Benz M120.

06/23/2026

The R2 Performance Package for the 197 SLS AMG GT takes performance to the next level with our proprietary ECU upgrade, in-house long tube headers, and sound & performance X-pipe exhaust.
Power output: Up to 620HP and 522 LB-FT
Gains: +37HP and +43 LB-FT
Built with high-quality stainless steel, tri-metal 200-cell sport catalytic cells, ceramic coating, and a power-proven X-pipe crossover design, this package delivers free flowing exhaust, reduced backpressure, improved performance, and a more aggressive sound.

This is your sign to give your W222 S63 Sedan the summer glow up it deserves ☀️ Upgrade your Mercedes-AMG S63 Sedan with...
06/22/2026

This is your sign to give your W222 S63 Sedan the summer glow up it deserves ☀️
Upgrade your Mercedes-AMG S63 Sedan with the RENNtech Sound + Style Package — the perfect blend of carbon fiber styling, luxury performance, and a deeper AMG exhaust note 🔥
Featuring the RENNtech Carbon Fiber Decklid Spoiler and handmade T-304 stainless steel Sport Mufflers, this package gives your S63 a refined motorsport-inspired look while delivering a richer, more commanding sound. 🏁
The carbon fiber decklid spoiler is crafted from premium pre-preg carbon fiber and finished with advanced UV protection for long-lasting gloss, depth, and durability. No drilling. No trunk modifications. Just clean fitment with 3M automotive tape. 🙌
Paired with RENNtech Sport Mufflers, your W222 S63 AMG gets improved exhaust flow, reduced back pressure, lighter weight compared to factory, and a deep, refined tone engineered to eliminate unwanted cabin drone. 🏁

06/15/2026

Introducing our reengineered equal-length headers for the Mercedes-Benz SLR McLaren, developed to improve exhaust flow, enhance sound, and increase performance.
At the heart of the system is a precision 3D-printed collector, designed as a true symmetrical layout. This ensures every cylinder receives equal maximum flow to the catalytic converter, improving efficiency, response, and power delivery.
The result is a header system built not only for performance, but for balance, precision, and a sharper, more engaging exhaust character.

+91 HP and +132 LB-FT is exactly the summer upgrade your C217 S63 AMG needs. ☀️The RENNtech R1 Performance Package takes...
06/09/2026

+91 HP and +132 LB-FT is exactly the summer upgrade your C217 S63 AMG needs. ☀️

The RENNtech R1 Performance Package takes your Mercedes-AMG S63 Coupe to up to 696 HP and 801 LB-FT at the crank, unlocking serious power from the 5.5L V8 BiTurbo without sacrificing daily-driver comfort or reliability.

R1 Package Includes:
✅ RENNtech ECU Upgrade
✅ 3rd Gen Diverter Valve
✅ High-Flow Air Filters

With improved boost control, faster turbo response, and reduced turbo lag, the R1 Package delivers huge gains across the entire RPM range — making your S63 AMG sharper, stronger, and ready for summer.

Ready to wake up your C217 S63? This is where it starts.

Address

7825 SW Ellipse Way
Stuart, FL
34997

Opening Hours

Monday 9am - 6pm
Tuesday 9am - 6pm
Wednesday 9am - 6pm
Thursday 9am - 6pm
Friday 9am - 6pm

Telephone

+15618457888

Website

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