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Mandrel bending actually does decrease the inner diameter of the tubing. Take a close look and you'll see.
True, but any type of edging usually disrupts flow. I was always told that you want smooth bends. Though I wont argue that diameter does change a bit, I would argue that smoother is better (look at the Micron Serpents!).
That aside, what exhaust is that? From my experience (which may be more limited than yours), most full system carriers use Ti and try to limit the amount of welding through the headers...I've run Termignonis, Akrapovic, and Yoshimura (this being the exception) and those welds aren't familiar.
oops didnt see the second page...lol
Mori makes real nice stuff. I was one of the first to get on the run of 200 slip-ons they made for us original '00 owners.
Yah I love it. It's a great exhaust. They do an amazing job with the craftsmanship. The inside looks exactly like the outside. The welds are all smoothed and burnished as they go along so there's no rough edges on the inside.