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Old 11-02-2012, 08:56 PM   #3
Registered User
Join Date: Oct 2008
Location: Northern Michigan
Posts: 1,355
My Ride: 330i ZHP
my advice would be to add as many mufflers into the system as possible. I feel I was able to remove the rasp finally by adding an extra muffler into the magnaflow cat-back system. I posted some detail on it in a thread, do a quick search and see if you can locate it.
2003 BMW 330i ZHP
ESS Twin Screw Stage 2 - Wavetrac - Headers - Magnaflow - BMW Performance
Turner Motorsports - Powerflex - StopTech

Build thread:
Wheelwell: 2003 BMW 3 Series
Fuelly: 2003 BMW 330i
rkneeshaw is offline   Reply With Quote