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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.

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.

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.

06/05/2026

The RENNtech Power Module ECU Upgrade for the Mercedes-AMG S63 E Performance W223 takes the M177 4.0L BiTurbo V8 with Electric Drive to an impressive 890 HP and 1,062 LB-FT of torque.

Engineered to enhance power delivery across the entire rev range, the RPM fine-tunes ignition timing, throttle response, and air-to-fuel ratios for sharper acceleration, stronger mid-range pull, and a more commanding drive.

Housed in a precision CNC-machined 6061 aluminum case, the module features pre-labeled wiring and connectors for a clean installation. A supplied bypass plug allows the vehicle to be returned to stock quickly, with the harness fully removable when needed.

06/03/2026

Three Mercedes-Benz SLR McLarens in one place? At RENNtech, that’s not a coincidence — and it’s definitely not a one-time thing.

Owners trust the best with cars that deserve the best. From icons like the SLR to the most exclusive Mercedes-Benz performance machines, RENNtech is where legends come to be cared for, refined, and perfected.

06/01/2026

🔥🚨New Product Alert 🚨🔥
The RENNtech Carbon Fiber Rear Wing for the Mercedes-Benz AMG GT C192 delivers enhanced rear-end stability, aggressive styling, and true motorsport-inspired functionality. Developed using advanced 3D scanning, CAD surfacing, CFD analysis, and 3D-printed prototyping, this AMG GT rear wing is built for precision, performance, and perfect fitment.
Crafted in Germany from premium pre-preg carbon fiber, finished in high-gloss UV-protective coating, and assembled with custom titanium hardware, this carbon fiber wing offers OEM-level fitment with no permanent vehicle modifications required.
For AMG GT C192 owners looking to elevate aerodynamics, performance, and exterior styling, the RENNtech Carbon Fiber Rear Wing is the ultimate upgrade.

05/28/2026

Upgrade your AMG with the deep, refined sound it deserves🔥
RENNtech Stainless Steel Sport Mufflers for the X290 AMG GT 63 4-Door Coupe and W/S W213 E 63 AMG are handmade from T-304 stainless steel at RENNtech Headquarters in Stuart, FL.
Designed to reduce exhaust back pressure, improve exhaust gas flow, and deliver a lighter-weight performance upgrade, these sport mufflers keep unwanted cabin resonance out while bringing out the bold AMG sound you want.
Fully compatible with factory exhaust valves for Comfort, Sport, Sport+ and Race modes.
Save 15% now through 05/31.

05/27/2026

Unlock more power from your Mercedes-AMG with the RENNtech ECU HHT (Hand Held Tuner) for the C209 CLK 63 AMG Black Series.
Engineered for serious performance, the RENNtech HHT delivers up to 534 HP and 485 LB-FT of torque, with gains of +34 HP and +20 LB-FT — all without removing your ECU.
The RENNtech HHT plugs directly into your OBD2 port, allowing you to switch between stock and tuned ECU programming anytime. Flash your vehicle in just minutes and reflash as often as you like.
With optimized ignition timing, throttle mapping, air/fuel ratios, rev limiter settings, and performance calibration, RENNtech ECU software helps unlock the true potential of your Mercedes-Benz AMG while maintaining daily-driver reliability.

For a limited time, save 10% on electronic modules like the RENNtech HHT through 05/31.

Upgrade your CLK 63 AMG Black Series with proven RENNtech performance.

05/25/2026

This Memorial Day, we pause with respect and gratitude — and invite you to shop our Memorial Day Sale with savings of up to 15%.
Save 10% on electrical modules (HHT, HSM, EVM, RPM)
Save 15% on sport mufflers for AMG GT (C192), AMG SL (R232), AMG GT 63 4-Door (X290) and AMG E-Class 63 (W/S213)
Save $250 on RENNtech Protect

05/24/2026

WIN A RENNTECH TUNED GT55 AMG for $50! MBCA’s Spring 2026 raffle is at full throttle, selling raffle tickets to win a RENtech-tuned Mercedes-AMG GT 55.
Founded in 1989, RENNtech has spent 35+ years pushing Mercedes-AMG performance beyond factory limits. This GT 55 is tuned to an OEM+ level of quality with RENNtech’s RPM ECU tune, the 4.OL BiTurbo V8 M177 engine gains +90HP and +82 LB-FT through modified ignition timing, optimized throttle mapping, and precision-dialed air-to-fuel ratios. The dyno doesn’t lie - 489HP becomes 579HP, and 582 LB-FT climbs to
664 LB-FT at the crank. RENNtech’s Exhaust Valve Module opens up your factory exhaust system’s valves to 100% open 100% of the time. More torque. Earlier delivery. Stronger pull.
One car. One winner. No MBCA membership required. Your $50 ticket could put you in the driver’s seat of one of the most legendary tuned AMGs on the road. Grab your ticket now at mbca.chance2win.org. Open to U.S. citizens 18 and older where valid. Tickets are available for a limited time.

05/22/2026

Allow us to introduce: RENNtech Protect 🙌
Vehicle Service Contracts for nearly all Mercedes-Benz models we tune. Protect your investment with coverage backed by the same confidence we put into our engineering.
Choose the plan that fits your drive:
RENNtech Protect Powertrain
Essential coverage for key components that keep your vehicle moving. Eligible vehicles up to 10 years old and 125,000 miles.
RENNtech Protect Comprehensive
Broader peace of mind for Mercedes-Benz owners who want enhanced protection. Eligible vehicles up to 10 years old and 75,000 miles.
Coverage options range from 12 months / 12,000 miles up to 72 months / 72,000 miles.
Sign your contract within 5 days and receive $250 off your coverage.
Give your Mercedes-Benz the protection it deserves. Contact RENNtech today for eligibility, pricing, and plan details.

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

https://renntechmercedes.com/, http://store.renntechmercedes.com/

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