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Old 01-09-2010 | 10:31 PM
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w8ye
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From: Shelby, OH
Default RE: Cure for GMS47?

The Macs muffler is not a tuned muffler like the original GMS muffler.

The Macs muffler has much more internal pressure and puts much more fuel up to the engine

The engine will have a lot less power with the Macs One Piece muffler than with the original GMS muffler

Yet the Macs muffler will never give any trouble