from what i've learned, using the 6-1 headers is really more for track use. since ur going to be in higher rpms most of the time, thats the header to use because it makes more hp at higher rpms. i'm going to be doing some autocrossing, nothing big, and will prob go with either a 3-2-1 or the 6-2-1. but, no, i dont know the hp specs either