the pro chamber/slp report is that its deep at idle which would pass for stock(very unsuspecting at the stop light), loud when cruising, when you get on it all hell breaks loose. my setup sounded better than the all mac setup on a mach 1 with headers<---(so the guy said). the reverb you get is awsome when driving by highway barriers or other cars.
i also impressed a guy with an 01 cobra also and he too had a modded exhaust which didnt sound too good. he followed me for the longest time the other day.
loud mouths or magna packs are the key for a non flowmaster sound. if you do run this setup give it time to set in.