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I'll try this on since no one does this.

Depends on the muffler. If it's a muffler with packing, I'd say you are out of luck. If it's a chambered muffler or no-packing straight through, solvent inside the muffler should dissolve any deposits.
 

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No packing in those but, I'd say you are probably just getting used to it, rather than them getting quieter.
 

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If they were packed mufflers like the Bassannis I have, they'd get louder over time if anything. My Dynomax Ultras sure did and these ones I have on my 2000 are 15 year old original to the car and look brand new and sound ridiculously good. Yet another knock against chambered mufflers. :)


But yes filling a bigass bucket with an appropriate cleaning solution and soaking them should to the trick. Then let them drain and air dry for a bit before re-install and prepare for a mini smoke show.
 

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I'm sure glad I picked the GT500s, now that I have a blower on the car.....
 
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