Long tubes and stock exhaust

[Magony15]

It would be nice if they all gave an optional X or H pipe that accepted the 3" performance connect headers. Had to modify my Gibson with the extra catless extensions that 2M included with their headers. Obviously welding is required.

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[BlueJay]

Anyone running high flow cats? With any exhaust setups? If so does it make a huge difference in sounds compared to a 400 cell cat? More gas smell? Or even power gains??