On a dynojet this M3 posted a baseline of 347 wheel horsepower on 93 octane fuel. At a mild 6.7 psi of boost from the supercharger on that same pump 93 octane with an aftermarket exhaust system output rose to a peak of 553.78 wheel horsepower. Basic arithmetic gives us a gain of 206 horsepower at the wheels. That is well over 600 horsepower at the crank. Repeatable, every day, bolt on performance for your M3. Not to mention an absolutely beautiful torque curve.
Dynograph courtesy of BimmerBoost vendor Undercover Performance @undercover @undercoverangie