i have a 2003 banshee and i just recently sold my pro circuit pipes for cpi's but i can say they kicked ass on all the other pipes but cpi's..... i had just the pipes and k@ns with a 270 or 280 cant remember what one but one of those and i kicked everyones asss with just pipes and K@N's ....... you should also use b8es plugs in sted of 9s