Lobster photo from Food Blogga
I spoke to Jon at Racefit about this exhaust. It is 54mm diameter titanium. You can't buy 54mm Ti tube, so Racefit had to roll their own. This system has 81 different welds and its own custom 6mm thick flanges. If you have to ask how much it cost you can't afford it. Racefit sell off the shelf end titanium cans though.