Your PE sounds great ... excellent choice! I wouldn't know when to shift if I had the stock exhaust, it's just way too quiet.
BMW Performance FTW ... it's expensive but OEM quality is nearly unbeatable, perfect fitment, and it counts as an "accessory" as far as warranty is concerned, not a "mod".
2011 BMW 335i E92 - Le Mans Blue, 6MT, M Sport. JRZ RS Pro, Quaife LSD, BMW Perf Exhaust