Hi guys,
I won't lie it does make it boomy below 2000 rpm mated with my race rear boxes but i have found on motorway driving you will be above that so actually on long drives there is very little drove. Kind of in a way regret taking it off as now with standard centre pipe and the race rear boxes whiles is okay still got most of the boom but it has some of the tone which sounded so great, but the wife just said its too loud for her to drive.
Mate would potentially consider a discount for the standard rear boxes so i cant put the car back to standard when i sell the car in the future.
to descride the sound they make this seems to be a good link ..
http://www.youtube.com/watch?v=g6F7J-oZGq0&playnext=1&list=PLF59DC3F754C9652E
sounds awesome i think