If so, what type is would be best?

You bought the wrong car if you want performance get a car like mine 6 speed 2006 GTO 6.0 liter 400 hp. All you will get is more noise if you put on a free flow intake system, or Cat back exhaust. Just noise not more displacement or cyls.

The tc is not a performance car. It uses a Camry 2.4 liter 4 cylinder engine. Leave it alone and it will last forever.

Nothing works well in a Scion TC.

To all who says it is not a performance car, listen up! l have a cold air intake(AEM) a performance chip, and a turbonetics twin turbo. My Scion now pushes out 278hp and 301 lbs of toque. And since it such a small light weight car, l haven;t met a mustang, camaro, lancer, Subaru, or z car l have not been able to blow away!

l am not sure, but l just bought a scion tc, and l love it!!!!

yes the do work but u wo not get the gain that u think u should have.the tc makes 168 hp in stock trim the intake will set u back about $250 & u will gain only about 2-5 hp max. a full exhaust from the motor back will set u back about $700+ & still only net u 5-15 hp.
if it were me would ''build'' a new motor with high performance pistons rods cam/s bigger injectors free flowing head a new computer/ chip & exhaust it would cost alot but l would know what l have & could do what l wanted to do as l can afford to do it