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274 Posts
Discussion Starter #1
my magnaflow muffler has about 1000 miles on it now, i noticed the sound getting louder, about when does it finish breaking in and stop increasing in loudness?
 

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well techincally there is a break in period... especially depening on what kind of muffler you have... its usually a couple hundred miles after u install it, but if its getting louder, i would check on that because the noise dampening material can be deteriating on the inside
 

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Honda Rookie
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carbon build up affects the noise of the exhaust if its brand new, but not that much. That might be what you are referring to. I know when my buddy had cherry bombs put on his 81 camaro (glass packed) they had a little sheet of paper with them that said as the glass gets blown out some the sound will change.

My borla was installed new and I haven't noticed any change in noise yet.
 

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Bobby Lane Racing
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New mufflers have packing in them. When they burn off they get loud. My Tanabe's are pretty loud now compared to when I first got em.
 
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