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I haven't seen any true under tail systems for the F4i; is the bike not built for that kind of exhaust, or are those exhausts just unpopular with the F4i crowd?
na they just arent capable of being run with a stock f4i set up (without looking extremely um "gay").... you need a 600rr swing arm conversion <---so the pipe can run behind your rearset... then if one really wanted he could run a undertail exhaust...
Definately a fan of the Yoshimura mine sings nicely at cruising RPM'S and is straight nasty at low and high rpm's. I love the crackle and pops during downshifting and such