FWIW, I test drove a 2011 E93 M3 at a local dealership that had a BMW M Performance exhaust system installed. Found it quite intrusive with the top down and rpm > 3500 ... so did the dealership (apparently) as they removed it shortly thereafter...
Anyway, GL!
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•SOLD - '08 M5 Sepang Bronze/Full Merino leather/ Exec Pkg/HUD/SMG/H&R/DINAN/Coded
•'12 E92 M3 Space Grey/M-DCT/ZCP/ZPP/DINAN/ACM Test Pipes/BPM StageII Tune & Coding/M Perf Exhaust, Race seats, Alcantra V2 steering wheel, gloss grills/ModeCarbon GTS wing/GTS DCT Tune, CF int trim, door sills/LUX H8 V3/CSF race oil cooler/Trackspec hood vents/GT4 Rep CF splitter & rotor ducting/Hawk DTC60/KW CS 2way NR/B'world/Hotchkis/Eibach/Apex
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