guy's spend the 80 bucks get the service manual.120 mains 40 pilot.all this talk about pipes.i got 2 exhaust pipes 27 inches long .1 3/4 od had the guy expand one end to 1 3/4 id so it fits over the header.painted them with 1200 degree exhaust paint flatblack.sounds better then my buddys 37 thousand dollar ironhorse chopper.stoped by the shop and put it on the sniffer .it's running a little lean.going up 5 on all the jets should make it perfect.so needless to say i got shorty pipes for sale