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There's no second cat on the system ( as there is on the OEM setup ) therefore you are removing an emissions control device.
I know AWE is reading this - their response on what is actually happening would be helpful as per guessing.
If that secondary cat isn't monitored, then what is the control? The primary cat is doing most of the filtering of emissions, with sensors monitoring the efficiency of said primary cat, so why couldn't the secondary cat be removed without penalty?
Can I be steered toward anybody that might have this in stock? Or mybe an out of country vendor? Only thing I messed up on building my daughters car. I should have bought this exhaust. ☹️