I wouldnt bother. V&H pipes have a tendancy to have a tinny rattle to them, the F4i needs a better pipe. those belong on 80's and early 90's kawis.

cut the stock muffler down a little. not obnoxious, but it sounds GREAT. my buddy has one on his F4i like that. next time I see him I'll try to get a sound clip.

 

it doesn't look like it fits an f4i, it has no space for the oil filter to come out between the headpipes.