Originally Posted by
SPUd
You will always get some mild gains from opening up the flow of an exhaust system on any motor. That said, the difference between the actual power and potential power on an NA vs turbo motor is quite different. The NA motor has less to gain (lower actual vs potential power).
Realistically, did any of us buy a celsior for it's performance? I doubt it. The best thing is, the 3uzfe motor will sound awesome with a decent set of mufflers (flowmasters, etc) on a 2.5" exhaust. Personally, as much as I love the sound of a 2jz, nothing sounds as good as a v8 with a good exhaust.