Is the exhaust piping for the Injen Dual exhaust 2.5" piping? If not who makes a good quiet true dual with 2.5"? I know of a few with 2.5" and 3" piping but the sound clips I have heard make all of 'em sound pretty loud. Needs to be big enough piping to not limit an APS TT set up looking for an access of 450rwhp
Thanks

Might as well go for a custom exhaust setup. Pick a muffler for a Supra that you like and run custom piping.