AC Schnitzer performance upgrades offer a unique solution to boosting your car's performance while retaining warranty cover on your car. Every AC Schnitzer performance upgrade delivers a substantial, but safe, performance increase and comes with a 3 year* warranty from AC Schnitzer to cover the tuned engine and drivetrain and run alongside your BMW factory warranty.

Stage 1 - Includes the Performance Upgrade Box, Ready for Install. 
 
Stage 2 - Includes the Performance Upgrade Box and Sports Exhaust ( Choice Between EC Approved or Non EC Approved ) 

Non EC Approved will provide an extra level of noise and tone over the EC Approved Sport Exhaust. 
 
Performance diagram - Stage I, 590hp. Stage II includes AC Schnitzer "Export" version exhaust for extra 20hp (total 610hp) - see below.
 
Performance:
M3 Stage 1 - 510HP>590HP - Performance upgrade only.
M3 Stage 2 - 510HP>610HP - Performance upgrade with sports exhaust.