How good is a throttle body upgrade if I have a Skunk2IM, AEM CAI, catback exhaust, random tech cat, DC 421 header, ZEX Stage 2 Cam, Adjustable Cam Gear, VAFC2 ? tuned to all around power not peak... 98WHP/96.7tq on the dyno. about what difference should I expect? I'd like to gain more torque and hp. I plan to go with a 68mm, since 70mm cost more and probably slow down airflow velocity.