1. add horsepower for a cheap cost.
Cold Air intake.
Cat Back Exhaust
NST Pulley Set
2. add horsepower for a higher but resonable cost
Dezod Turbo Kit. for roughly $4,000 you get a 120hp increase, not engine problems or transmission problems, as long as its a manual and not an automatic tranny. turbo kit will no harm the engine, the tC's engine has held up to 14psi of boost from turbo kits, as seen well into the 400hp range on a stock engine and will be fun.
from option one: if you buy everything name brand and top of the lne youre looking at $2,500 with 50hp max.
from option two: like i said $4,000 120hp increase and option of tuning higher for more power.
dont go for the supercharger.
1. its een discontinued, 2. not reliable. 3. the supercharger cost $5K and gave a 50hp increase. turbo kit cost $4K and gives more power out put, plus as i said, can be tune for more power supecharger cant be tuned as a turbo.
05 Scion tC owner.