Would also be interested how your exhaust sounds and what u consider too loud. Have u got a video clip?
My Motordyne shockwave))) + Berk HFCs is loud, but nicely so IMHO 
Sounds like this:
Cold start
Dyno run
Cheers 
__________________
501 BHP, 590 Nm (422 rwhp) AAM TT+I/Plenum|CJM S1 FRS|C/Clutch Stage 2|RJM CMC|ZSpeed CSC|Z1 Oil cooler|Motordyne Turbo ShockWave)))|Torqen Coilovers|Stanceparts AirCups|Amuse bodykit|GReddy|AEM|ONEighty|Mishimoto|STILLEN|Eibach|SPL|B&M|Radium|EcuTek|BC Forged RS45
|