Oh god, He didnt order a clogged cat, he ordered my catless ZZP DP, and AFB, DONT drop any pulley sizes until you're engine is safe to do so.
READ THIS. http://www.grandprixforums.net/f81/s...car-17482.html
A 2.8 pulley requires massive amounts of mods, including an intercooler.
Please dont blow your **** up.