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I have a 325xi and nobody lists a cat back exhaust system. Can I do a hp muffler and cut out the resonator or will it be too noisy?
 

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i paid 200 bucks got my muffler cut out and had two glass packs put in. It sounds pretty nice but i am going back to get one resonator cut out. It all depends how loud you want it.
 

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The purpose of the resonator is to make the muffler invisible to the exhaust gases, that is, so the muffler doesn't create a back pressure or backwave. So there is no reason to remove the resonator unless you have really really increased the hp., and then you need a bigger box for the resonator.
 

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I thought if you removed the resonator it would free up some flow, equalling more power??
 
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