New exhaust.
#7
just pick one you like the sound and look of the exhaust is going to do virtually nothing except make your card louder without forced induction and a very marginal gain from adding a header. If you are planning on doing FI then more thought should be put into the exhaust system.
#13
sp2 or PM axleback for quiet sound. i also suggest the Ark DT-S oem style catback. call ark and ask for ted. see if you can still get in on the sponsorship deal. it ended 2 days ago but maybe he'll let you. last i heard all the spots weren't filled yet.
#15
do you want an axle back or a cat back? buy mine its a better deal!!
https://www.scionlife.com/forums/viewtopic.php?t=165317
https://www.scionlife.com/forums/viewtopic.php?t=165317
#20
get HKS, you won't ever regret it. If you ever end up getting headers or FI, HKS will still be the best. Least restrictive design. You may not like the look or the tilt, but sound is the most important thing so go HKS. You have a wide array of choices, so choose wisely.