the srt4 runs 2 times the boost the sr20det does from the factory (s13 trim) and almost half a liter more displacment int the motor. Make it an Sr24det 2.4 liters and give it 14 pounds of boost and it will pull similar numbers. And if we are talking apples to apples then compare the drive train. The S13 is superior for its RWD bulletproof drive train and solid motor that has proven itself over and over to be ultimately indestructable unless an idiot or rookie tunes it. Srt4 motors are awsome to but suffer from the FWD layout and the capability of the car overall to handle is limited with its high ceter of gravity and less the par wieght disribution.