| Are you doing cat-back or turbo back exhaust? This will make a difference in sound. A cat-back exhaust will definately be quieter. I haven't personally heard the RBP or magnaflow exhaust, but my guess would be that RBP would be louder. Another thing you could do is to buy like a silverline or RBP exhaust if you can find a good cheap deal on it and buy the magnaflow muffler and install it. I run the MBRP turbo back exhaust and it has a noticable drone on my truck at highway speeds. I think my truck was quieter cruising straight piped.
__________________ 2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7
4" turbo back MBRP exhaust, Cognito UCAs & HD tierods
TST Powermax Programmer, Diablosport Predator
285/75-16 BFG T/A KOs, Eagle Alloys Series 187
Clifford 2 way remote start, High Idle, Bilstein 5100s, 1.5" lift blocks
AFE Magnum Force Stage 2 Proguard 7 intake Waiting install:Rancho Steering stabilizer....all thanks to NorCal Truck  Support your Supporting Vendors |