Alright, I'm sure this has been covered a lot, but I don't have time to go searching, I'm getting some new piping ran today but I don't know what size to use.. Skunk2 said to run 60mm which converts to 2.36 inches, and I'm not sure whether 2.25" would be sufficient. My mods are: -JDM B16a -Skunk2 Intake Manifold -Thermal Intake Gasket -MP2 Lightweight/Underive pulley (Only 1.14 pounds!!) -Cold Air Intake w/ custom ram air -Aerospeed FPR w/ Gauge @ 56PSI I plan on getting a skunk2 throttle body, and might step up to some cams later on down the road. What size exhaust do you recommend, and would 2.5" be too much? This is on a 1990 Wagovan, btw..