I am going to be fabbing up some downpipes with 2.5" tube, it will have a a piece of fle on it and both front and rear flanges. I chose 2.5 so that it still has back pressure to compensate the cat not being there so that torque is not lost just to make more hp. So I will have a catless dp for sale in the next week or so. I willsell locally only will not ship! $140