Things that l can add to the engine like a turbo or supercharger (which is better for a tc), intake system, things like that.

Turbo will make more horsepower & torque but supercharger (~200hp & 185 lb-ft) comes with a Toyota warranty. TRD parts are not cheap either.

ZP l is out of business and screwed over a lot of people when they just closed and kept peoples money but never sent parts.

A cold air intake and exhaust is where l would start.

On my 06 blue blitz scion tc, l have the supercharger, aem cold air intake, and borla exhaust...i would not recommend the turbo unless you have the money to play around with..I'd rather turbo up an sti or evo with that cash.

Alright, few things here. If ur going to go the forced induction route. l would revamp ur engine. You will get more horses out of a turbo but with the stock engine l believe (do not quote me) u can safely run 8 lbs of boost. If u have the cash, make ur engine so it can handle more. The new supercharger from TRD is a better design then before but only gives u 60 hp gain. Look into a Greddy turbo if u want real power. As for exhaust, l highly recommend Borla if u can afford it. l have magnaflow on my tC & it sounds descent. For intake, go to scionlife.com & the dyno sheets prove that the Injen CA l is one of if, not, the best cold air system for the tC. You can add headers for more power (good luck in CA with SMOG & CARB though), & upgrade the ECU chip but now ur messin with some heavy stuff (mess up on that & ur F-ed in the A lol) (If ur thinking of going the chip route look into a good piggyback instead) l would recommend the supercharger, Injen CA l & exhaust which all together should add about 75 horsepower give or take & put u at 235 hp all together. Not bad for a 3000lb lower end coupe if u ask me. Hope u have the cash though =)

ZP l Stage 1 turbo kit. Do not even waste your time with the TRD S/C unit unless keeping your warranty intact is your main objective. If you want a fast car, I'd recommend getting something else instead of wasting your time, energy, and money into a tC. Yes, anything can be made fast with enough money, but does the end justify the means?

Edit: Thanks Emiller. l no longer have my Scion tC, so apparently l am not up to speed on things. Thanks for setting it straight bro!