As someone with stock downpipes and an Eisenman Race, I think it works quite well. It's loud, but not max loud because of the stock downpipes. Personally I think the Akra is the loudest, but that could be because I've only heard ones with aftermarket downpipes.
__________________
2017 X5M, Donnington Grey, Aragon Brown
Eisenmann Pro, Dinan Intake, BM3 Stage 1, XHP Stage 3
21" Vossen VFS-1 on Michelin PSS
|