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I had the exact same issue with this part. Daniel finally figured out that with the SDP, you need to order the standard quad exhaust rear center outlet and not the sport exhaust version. I ordered all of the carbon parts to swap out the plastic, except that this last piece took three tries before we got the right one.
sport exhaust with round oval tailpipes but not SDP uses one version of the rear center outlet (the one you received)
quad standard exhaust and sport exhaust with SDP uses one version (the one you need)