lamb_daiquiri is right

all depends what sort of dollars you want to spend too. personally i think the length of the extractor pipes and type of merger collector system you use is most important. i haven't seen a set of extractors in aus with a proper merger collector, mind you its an a-series (dont hate i like the a) and i would put 2" mandrel bent system on there with a half decent muffler not a gay as cannon