You tell us. What do you want to accomplish? The AMS GT35R setup seems to be the most proven big HP setup on the streets right now. All those videos of that Evo spanking everything under the sun is with the AMS GT35R built/installed/tuned by AMS. I don't know what turbo the Vishnu package is using...it doesn't say in the description. As for the other AMS packages, I'd recommend steering clear of the other kits (3071/3065)...people just have not been happy with the lag as compared to the actual HP output.