Eurocharged before and after E9X/E92 M3 S65 V8 custom dyno tune results - + 36 wheel horsepower
The S65 V8 responds very well to tuning and a quality custom dyno tune can extract quite a bit of power. Eurocharged was able to take an E92 M3 from a baseline of 339 rear wheel horsepower to 375 wheel horsepower with just tuning for a total gain of 36 rear wheel horsepower. This dyno tune done on a Dyno Dynamics in Houston. The Eurocharged name should be familiar from their Mercedes tuning but many likely don't realize they are able to do a custom dyno tune for just about anything.
That includes a BMW M3, Ferraris, Bentley GT's, Aston Martin's, basically you name it. Eurocharged has also been working with Underground Racing of Twin Turbo Gallardo fame. Great results and very well done, contact them at www.eurocharged.com
if interested. Eurocharged also tends to have the most competitive tuning rates in the game today.