if you do a pulley, cut atleast the u-bend out and get a o2 simulator from caspers or somewhere else. to safely run a pulley your gonna need a CAI and u-bend at minimum. others have run it with nothing else and been fine. other have run them modded and blown their **** up. it just depends on the car. but to keep you safer id do somekinda exhaust work. and do a scan after the pulley just to see how much timing is being pulled from the motor due to knock. cause you are gonna have it. and dont go below a 3.4. so either a 3.5 or 3.4 and you should be fine.