Can anybody tell me about which throttle body spacer to use? I noticed in 4WD parts catalog they sell a 60mm and a 62mm spacer (Hesco brand). Do I need to measure my throttle body bore? I have a '91 Laredo w/ an automatic transmission, 4.0L. I have also heard of having the throttle body bored to a bigger dia but not sure how to do that. I know they sell them with bigger aftermarket bores but I'm on a budget. Also I want to add a cold air intake (I think). I am looking to increase horsepower and torque any way I can. These two things will help as I understand it. Fuel efficiency would be nice but I prefer the extra horsie's and torque for trails. All input is greatly appreciated. Thanks!