I'll go with a Turbo set up
combine the weight of the tC and the power it will get from the turbo
the results will be insane
the most i've seen so far is 443 WHP 474 TRQ at 22 Lbs of boost
YouTube - Scion tC-x 443 whp dyno pull
if you dnt have the money then a simple I/E/H will work lyk KTeevan said
there are also some pullies and other goodies to free up power