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A muffler bypass has the following benefits over the Gundo Hack:
1). Muffler is removed... reduced weight in rear of car.
2). Muffler is removed... better air flow to the turbos.
3). Muffler is unmodified... can be sold or can be returned to stock.
Steve nailed it. #2 is the BIGGIE. Removes a heat source. Here are mine in Black velvet. Ceramic powder coated from Darin ad FD Motorsports. Just got these back on Christmas Eve: