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I recently backdated my exhaust to the 74 SSI heat exchangers. They came with the sport muffler that had tips exiting under the license plate.
The underside of the whaletail was considerably dirtier after a run on the highway. A switch to a dual outlet B&B muffler with outlets near the wheels got rid of the problem.
I am now going with a Borla muffler and have the B&B for sale. Similar outlets but higher quality, appearance, warranty and sound suppresion, with comparable performance.
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