ive done a lot of research on this.
on our engine, rasp is mostly coming from the combination of 60 degree with an xpipe design.
what ive found that other cars have done to eliminate the rasp is one of these..
thats a magnaflow tru x muffler. think x pipe in a muffler.
you could put one after your x pipe, or alternatively, you could have an xpipe built with one
2013 Performance Pack, MCA, Leather Recaro's, NAV
Steeda Cold Air Intake | BBK Throttle Body | Steeda Shifter Bracket | Whiteline Transmission Mount | Magnaflow Street Catback Exhaust | Tuning Super Store Tuned on a Diablosport Intune i1000 | Eibach Sportline Springs | Koni Sport Dampers (Yellow) | Whiteline Lower Control Arms
Team Magnaflow | Team Road Race Motorsports