I like the look of the mitre cut, but not the function. They appear to allow rainwater in the pipe. That's why I went with turnouts. Even they let some water in, so when parked and expecting a storm, I put milk jugs over them too keep the water out. My exhaust guy wasn't going to put a muffler on the system, but I insisted and it still sounds good, but it's tolerable to passengers and bystanders alike. There is one muffler coming off of the turbo downpipe and splitting into two. The stacks themselves are 4" by 5 feet long and I got them at the local Freightliner dealer. Good luck.