I'v driven both....my buddies Vortech, and my Greddy TT. It's strange....for stoplight racing, they are rougly the same speed. But its the way the power is delivered. The SC driver needs to really rev the crap out of the motor to keep up, becuase the power is more linear, and peak power doesnt kick in until redline. The TT has a MUCH stronger mid range power band, and to me, seems more fun to drive everyday. When you are in the SC, you honestly dont feel hardly any extra power until you really get on it...and beyond 45000-5000rpm. With the TT, if I just dip the throttle in any gear, it zooooms forward.

Hope that gives you some additional "soft" comparisons.

At the end of the day, it comes down to money, and your purpose for the car. If I could do it all again, I would go with the APS kit in a heartbeat.

 

i know that when 4000 rpm comes around (and it gets up there quick-very little lag) the tt power throws you back in your seat... i'm happy with my decision!