I am planning over the winter to bore out my Throttle bodies.Being a machinist it won't be a problem.
What I have been thinking lately that going to 58mm might kill lowend torque,but gain highend HP.Even with a good tuner.
I have the supertrapp,pcIIIr,k&n filter and topless now.

Has anybodytried?Did you lose or gain?

vinny,
i have the same setup as you...
what are you putting out for rwhp?
sorry about the off-topic post...new guy here!:)

I have read in the other post that Super Kaz,and Ketsugo said that it not worth it to go to the 58mm.
But has anyone actually put them on a stock motor?Do you have dyno results?
The dealer that I go to now Has been putting 58mm on their drag bikes,but that is dragracing.
Can someone prove that they are not worth it on a stock motor?I wanna see hard facts that they aren't?not theories.
Putting bigger throttle bodies on V-8's do make a difference.Why not on the v-rod?