i'm thinking bout getting an hmf slip on exhaust. i was looking on hmf's website and they say to go 5-8 sizes up on the main jet. now what jet should i go to. i live in central illinois and i can't figure out what jet would go good with that exhaust for my location.

 

i live in northern illinois...or should i say "land of CRAPPY RIDING" lol (at least we have Badlands and Silver lake...)

but anyway...to your question:

I have a White brothers pipe (i have gone through a few pipes now) and the most i have gone up, is 3 main jet sizes.... 5-8 is quite a bit... unless they are counting the in between sizes (170, 172.5 175)

Stock is 165 mikuni, so i would start out with a 175 Mikuni (what i run) and see how that works.