My buddies Scion is actually a five speed manual, but that shouldn't make much of a difference right?A 2012 Tc was spec'd at 3100 lbs, 180 HP, and a six speed auto. So performance should be equal or slightly slower than a 33-3400 lb SHO auto with 220 HP.
When my '92 had 150,000 well-maintained miles I had a replacement filter and a Borla catback and a y-pipe with high-flow cats and underdrive pulleys. These were the bolt-ons that were allowed by my autocross class rules. The car dyno'd at 198 HP and mid 180's torque, so all of that modding was probably worth 20 or max 25 HP, figuring that it was 220 flywheel new and you lose ~15% or so to driveline losses for FWD. That was a lot of money for 20 HP. You aren't going to greatly exceed that without going for cams and big butterflies - that is what moves the air. Then you'll need a tune to allow for those new parts, and only then can you start thinking about closer to 300 HP. Beyond that lies big bucks, and pretty much all used parts at this point, hardly anyone is supplying performance parts for these any more.
But that's a fair assessment. I think I would be better off doing those mods if it was easier to tune huh. But the money is only half the problem. The other problem is there aren't many parts