I have an '03 kfx400 and will be installing a pro circuit T4 full system and twin air filter. The airbox lid will be on with no holes in it. Can I just go with a bigger main jet or will I have to mess with pilot and all that other b.s. as well?? What size jets are you thinking for this setup at 1100 ft. elevation???

 

Not trying to be a butt, but have you tried the suzuki, or kawasaki forum?
Justin