3 for now 4" later.. cant give away much more detail than that yet..:biglaugh: btw thanks again and I will ship your stuff out later today. make sure u keep me up to date on yoursforeverpsycotic said:Twin t28s? Wow, looks like you are going to have one hell of a time with that beast. What are you going to do with the exhaust? Twin 2.5 merging into a single 3 or twin 3 merging into a single 4