The same thing that's wrong with the DT V2 system. Not enough isolation from engine movement and vibration. I remember last year when the first aftermarket exhausts were released, everybody talked about how the exhaust really didn't need a stainless flex joint. Now look a year+ later and almost everybody is using one to get their exhausts to live for any amount of time. A slip joint or ball joint does not isolate the system from vibration and movement. It may be spring loaded, but there is still direct hard contact between the cat & the rest of the system. smart knew this, that's why they put the flex coupling in there, to isolate and dampen vibration transmitted from the engine. Any exhaust developed will need this or sooner or later it's going to fail, or cause the flange on the cat to fail.
Linear Mode
