So there are other GSR IM faithful out there... I have not done it yet, but what I'm going to do is ship my throttle body and IM to George at WWW.MAXBORE.COM and he will bore them out both to 64mm- same as Skunk 2 IM and install a new brass butterfly. You would need to buy new TB and IM gaskets if you have never removed these pieces. I would not let an inexperienced shop do this for me. My parts are already in a box ready to ship, I just need to wait to get paid.

www.maxbore.com