Aftermarket Modifications
Common performance improvements include wheel and tire replacement, aftermarket exhaust kits, and replacement or reprogramming of the Electronic Control Unit, which removes the 155 mph (249 km/h) speed governor. To boost acceleration times, some owners disable the car's slip reduction feature and program the automatic transmission to start in first gear instead of the normal second gear. Numerous other modifications exist for the car, including increased displacement up to and including 6.5 liters, nitrous-oxide systems and a few custom supercharger systems to boost output to well over 400 HP. Mercedes tuner RENNtech made a series of staged upgrades that included items such as larger air intake boxes, custom EEPROM chips for the fuel injection computer, customized transmission and valve-body modifications, larger diameter front anti-roll bars, a six-speed manual transmission, and ASR-disabling kits. RENNtech also offered (and continues to offer upon request) displacement increases up to 6.0 liters.
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