I am a new member and i own a 2004 eclipse gt with an auto trans. Write now the mods i have are a cold ait intake, throttle body spacer, headers with heat wrap, alumin crank pully, and a tune up. I'm running a 2.5" custom exhaust with a high flow cat and i was wondering if anybody had any tips on what might be the next best thing to give my car more power at a decent price. And if my exhaust is a good diameter?