I heard of this guy on ebay named Jerry who bores out and polishes stock throttle bodies for about $70-$80. I checked him out and he's legit. I wondering if it would be worth the $80 to have that done with my set up, or if anyone here has ever had something similar done with theirs. Also, how would it, if at all, effect my fuel efficiency? I have an 2007 4.0 pony package with a CAI, headers, X pipe, GT takeoffs, and a SCT programmer with Bama tuning. I don't plan on ever getting a supercharger, turbo, or nitrous.