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The GMMG is chambered pipe (perforated pipe within a pipe), not a glasspack. A chambered muffler is like the Flowmaster style that breaks it into differet "chambers". The LM1 is the most obnoxious cat-back you can get for the 4th gen cars. You don't want that on a daily driver. The GMMG isn't as bad but get to you after a 1+ hour drive. Short to medium drives it sounds great and will put a smile on your face. Plus it's stainless so that may help justify the cost compared to other aluminzed cat-backs that are cheaper.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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