Installed along with Berk HFCs. Previously installed Top Speed AB's. Cold start definitely wakes the neighbors in Nov. Idles down to about 1000. 1st & 2nd have volume but the whole system gets very mild in 5th gear and above. However, if you open the throttle back up in 7th gear you & everyone else will know that you are accelerating. If you mash on it, most ppl are gonna turn to look. Deceleration from 4th gear down gives a nice rumble. There's plenty of rasp but not overly done.