Originally Posted by PaulZ370

The sound will settle down quite a bit after you put a few miles on the system (a few hundred miles), especially when warmed up. I have the 18" Resonated CBE and Resonated High Flow Cats (all FI), but still, at cold start-up it shakes the whole house and I'm sure my neighbors can hear it nice and loud... however, once the RPM's drop (30 seconds later?) the sound is still deep and rumbly but a lot less noisy. I usually do creep out of my subdivision in first gear at low rpm's to keep the noise down. Once warmed up though, the exhaust is at a perfect note: at idle, you can just hear the deep rumble, but when I put my foot in it, it sounds ."..like a Ferrarri..." (I'm told - not making this up!). So, my advice is - be patient, it'll get there. Now a small caveat: not sure about the Carbon Canisters if they are louder than the stainless, but I'm sure that there shouldn't be that much dffference. Are you still on your stock cats by the way?