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From ECU tuning to differentials, we have your Mercedes products covered. GoodSpeed is Arizona's largest stocking RennTech distributor, and it doesn't stop there. The team at GoodSpeed has built more Mercedes-Benz from mild to wild than any other AZ performance shop, period.
Super charger upgrades,
Custom fabrication,
Software tuning.
And at GoodSpeed we use the only Mercedes approved dyno available. (MaHa)
Can't find what you are looking for? Just send us an e-mail info@goodspeedperformance.com
New products are being added daily it may not be up yet.
Featured Products
| Akrapovic Full Titanium Evolution Exhaust System | |
 | Akrapovic titanium exhausts are not just about appearances. Sound, weight, and performance are all part of the equation as well.
The Evolution system for the Mercedes SLS produces not only gains of 15 hp, but reduces weight by an incredible 45 lbs over the stock system! Soundwise, the system bring out the true character of the car. Deeper and more aggressive than stock, they retain the trademark personality of the 6.3-liter AMG engine. The Evolution system is notably louder than OEM, but is still perfectly suitable for day-to-day driving.
The Mercedes SLS Evolution Exhaust includes the Titanium Evolution (catalyst back) System, full carbon fiber exhaust tips/bumper inserts, bypass va... | GSP Price:
$13200.00
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| RENNTech ECU Upgrade for SLS | |
 | RENNtech tuning software for Mercedes offers significant gains in horsepower and torque across the vehicles entire power band. By modifying ignition timing and throttle mapping, optimizing air/ fuel ratios, increasing the engines rev limiter and modifying boost mapping for turbo charged vehicles, RENNtech performance software unleashes your Mercedes true potential.
| GSP Price:
$3495.00
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| RENNTech SLS Carbon Fiber Front Splitter | |
 | This carbon fiber front splitter integrates flawlessly with the original lines of the vehicle while boosting the overall testosterone level of the sporty SLS. RENNtech's one piece front splitter flows seamlessly into the front apron and is a simple, bolt on component which improves vehicle aesthetics and increases front end down force. All this while still maintaing the same approach angle as the OE front fascia so the RENNtech splitter retains the same clearence for parking stops and steep driveways.
| GSP Price:
$3950.00
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| RENNTech SLS Carbon Fiber Rear Diffuser | |
 | Our rear diffuser is the companion component to the front splitter and functions to decrease drag and increase down force by improving the underbody airflow and its transition to ambient air. As with the front splitter, our rear diffuser is manufactured using the high quality pre-preg carbon fiber and is a quick and easy install that requires no modifications to the SLS's rear bumper or underbody.
| GSP Price:
$4495.00
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