it's rev limited.. not sure to what rpm, i think 7,000..
when getting your car tuned with an aftermarket vender you can ask them to adjust or delete your rev limiter but hey, it's there for a reason.
2008 M3 Sedan + TestPipes + Tune [sold]
2014 M6 Coupe + AMS Downpipes
2012 CLS63 AMG + P30 PerformancePackage