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I was analyzing the footage sent by Leif997 and some footage I took of a GT3 Cup Middle East race with a Supercup exhaust (it's a straight pipe out on those cup cars with the Supercup configured exhaust, but sometimes they just have the center section installed to quiet them down) and they sound practically in distinguishable.
Cup uses cats and center muffler, and Super Cup uses cats and straight pipes.
This is louder than Cup and should be dead on par a Super Cup.