The T25 is only efficient to between 230-250 hp unmodified. The GT28R to about 280, the GT28RS to about 320, and the GT30R (hiboost's project) to 500hp. The thing is that Garrett lists the min HP for an efficient GT30R at 350HP. I am thinking as soon as you install that kit your car is no longer a daily driver. Garrett recommends for between 200 to 420HP on a 2.0-2.7L engine, so this would be ideal for dual maps. The bad part about the GT32 is that it is a journal bearing (not ball bearing), which means slowing spooling. If I upgrade, I will go with the GT28RS because I plan to get between 320-350HP on mine. I will be keeping an eye on the success of those who buy the Hiboost kit though.