KA24DET is proven to make more power than a stock sr20det. I found this out on many websites and in my import tuner. Also the Greddy kit is a complete bolt on turbo kit that makes about 250hp on just 6lb. of boost with the greddy intercooler. Because of the KA24 displacement less boost is needed to make power. Also consider this...Which seems easier to do, A Turbo Kit bolt-on, or a complete engine swap. Don't fall too much in love with the sr20, though they are still nice, their not all cracked up to be.