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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.

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.

05/21/2026

Upgrade your Mercedes-AMG with the unmistakable sound, performance, and craftsmanship of RENNtech. Engineered specifically for the Mercedes-AMG R232 SL 55, SL 63, C192 AMG GT 55, and AMG GT 63, our RENNtech T-304 stainless steel sport mufflers deliver a sharper, more aggressive AMG exhaust note while maintaining full compatibility with the factory Mercedes-Benz exhaust system.
For a limited time during our Memorial Day Sale, you can save 15% on this high-performance AMG exhaust upgrade.
Designed for drivers who demand more from their Mercedes-AMG, each RENNtech sport muffler set is built to reduce exhaust back pressure, improve exhaust gas flow, and enhance cylinder scavenging. The result is stronger performance, improved responsiveness, and a more engaging driving experience behind the wheel of your AMG SL or AMG GT.
Factory exhaust valves remain fully functional, allowing seamless use of Comfort, Sport, Sport+, and Race mode settings. Whether you want refined cruising or a more dynamic Mercedes-AMG performance exhaust sound, RENNtech sport mufflers give you the flexibility to enjoy both.
Each muffler set is also lighter than the factory units, making it an ideal upgrade for Mercedes-Benz and AMG enthusiasts who want improved sound, performance, and weight savings without compromising factory functionality.
Handmade at RENNtech Headquarters in Stuart, Florida, every RENNtech AMG sport muffler set reflects the precision engineering, premium materials, and craftsmanship trusted by Mercedes-Benz performance enthusiasts worldwide.

05/20/2026

Send your European Exotic and Luxury car to RENNtech where we deliver the high-quality service these vehicles deserve. Every day we work with precision, passion, and commitment to provide meticulous service for your vehicle. These two SLR McLarens are a reminder of the standards we stand by every day.

05/14/2026

Upgrade your W212 Mercedes-Benz E-Class with our premium pre-preg carbon fiber trunk spoiler engineered for style, fitment, and performance-inspired aerodynamics.
Designed specifically for the 2010–2016 Mercedes-Benz E-Class sedan, this high-gloss carbon fiber spoiler enhances the refined factory body lines while adding an aggressive AMG-inspired look. The UV-protected clear coat delivers a deep gloss finish with a carbon weave appearance that complements OEM AMG carbon fiber styling.
Built for a clean, hassle-free install, this W212 E-Class spoiler requires no drilling, no trunk modifications, and mounts securely using 3M double-sided automotive tape.
Perfect fit for:
Mercedes-Benz E-Class Sedan W212
Model years 2010, 2011, 2012, 2013, 2014, 2015, 2016

05/13/2026

Unlock serious performance from your Mercedes S/W212 E63 M157 Biturbo 4MATIC with the RENNtech Intermediate ECU Upgrade 🏁
Engineered for daily drivability, reliability, and power, this TÜV-approved ECU tune delivers up to 638HP and 695LB-FT of torque, with gains of up to +33HP and +49LB-FT across the RPM range.
Designed for Mercedes-AMG models equipped with the M157 Biturbo 4MATIC engine, this intermediate ECU upgrade is perfect for drivers who want a stronger, faster, more responsive daily driver without adding unnecessary stress to driveline components.
Ideal for regions with extreme heat, high altitude, or fuel quality concerns, this RENNtech M157 tune offers a slightly reduced calibration compared to the standard tune while still delivering aggressive, white-knuckle AMG performance at an excellent value.
Performance, reliability, and everyday comfort — all in one Mercedes-AMG ECU upgrade.

05/07/2026

For over 36 years, RENNtech has stayed true to one promise: performance without compromise.
From iconic magazine covers to legendary builds, these moments capture the evolution of RENNtech engineering and the passion that has defined our brand for decades. Each feature is more than a headline—it’s a milestone in a legacy built on innovation, precision, and uncompromising Mercedes-Benz performance.
What began over three decades ago continues today with the same commitment to delivering world-class power, refinement, and reliability for enthusiasts around the globe.
36+ years strong. Countless features. One philosophy: Performance Without Compromise.

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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