I have read many threads concerning the types that tC owners use. Reading some of the threads doesn't provide very helpfful informatio, no offense guys. But i want to know the performance, the HP gains and etc...you guys know how it is. I got a 06' scion 5spd. and i want an exhaust for it. I deciding between three exhaust systems.
HKS HI Power, Injen SES Catback, and Tsudo N1 catback. So if you guys can give me you opinions on which one you would prefer to help me narrow my choices.
thanks ,

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06' 5spd - TWM SS stage 2

all three of those exhausts are axleback and only provide a 3-4 hp gain. Soundwise, I prefer the HKS because it is the only one that has no rasp whatsoever. If you want more hp, then u want a cat-back exhaust system such as ARK, Magnaflow, Borla, Megan, Precision Muffler, or Draxas. ARK and Megan have that JDM Cannon look (like the drift style exhaust), whereas the others look stock-ish. Hope this helps. Oh, and the cat-backs range from 6-12 hp more.

All I can say is search there are too many of these threads asking the same thing.