I installed Selkirk DSP pipe and see some problems in the future. I also kind of wish I would have gone DVL pipe now. I've seen on the forum where the tolerances are better with dvl. DSP is sloppy in my opinion and the screws strip out easily. Oh well, it's done now and time will tell. I did seal one joint with furnace cement it was so bad. Guess I can always make new screw holes on the ones that stripped out. Just a rant.