I have been reading up on the throttle body modifications and was wondering if you bore it to 52mm all the way through. I think what I have read says you just go down to the butterflys. Am I correct? Ihave access to a milling machine and was wondering if I can bore it all the way through or if you just go to the butterflys? Iwill get bigger butterflys made if I have to so that is not a problem. Thanks for any help you can give.

 

you go all the way through because it starts off from from a 50 i believe down to a 48 so do go all the way through and buy new blades

 

Okay thanks for the info.

 

Look up fastman threads there are ton's of them