If you're talking about the HKS Hi-Power exhaust, then that one is not too loud and has no rasp at all. It is rather tame, but will open up if you get on the throttle.
I'm running them with Mortordyne ART pipes and there is still no rasp at all RPM ranges. It is a nice exhaust if you don't want to be obnoxiously loud. It is good if you have a long commute or go on longer drives because no drone either.
