Deep enough growl will eliminate rasphayaku said:No can do. Rasp is here to stay. Changing exhausts only changes the volume and gives it a deeper growl... rasp is still there on all Eisenmann, Tubi, AA, Supersprint, Dinan, etc etc etc.
The rasps comes from the heads/valves.. some think its double vanos... Only case reported to having removed rasps did a cam change... but no sound clips.
don't worry too much about it... you'll get used to it.