Yeah I love my top one and yes it is loud as hell for such a little pipe. As for the circuit pipe brent, keep a close watch on it. They tend to destroy themselves. The ones ive seen break the mounting bracket, the seams start to break apart and ive also seen the pipe completely break at the header. While you're still fabricating on it, you may want to add some extra bracing to help with the destructive vibration the pug motor puts out. As for the performance, I thought it was a great pipe. Pulled very well in the low and mids. Just some knowledge i'd throw your way.