I have no idea yet. Twin Loop would be interesting, but thats the part that we need to think about is the muffler. Piecing a 3" exhaust together with stainless steel is with all the proper hangers and sensors is the easy part. Choosing a nice muffler is the crazier part.Speaking of exhaust system, what exhaust muffler type are you guys planning to build? twin loop? N1 style? 2.5 inch diameter?