I purchased a 2008 ga gt white in color. The only thing done to car when purchased was a set of flowmasters. I got a dyno and was at 311. This past weekend I got a set of long tube headers with a 2.5 pipe upgrade, vararam cai, ported throttle body, and a 3000 stall with a tune. I was happy with the outcome on the dyno with 375 and 378 on torque. Next on the performance side is cam, heads, and intake. Must say I'm loving this car.