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Re: Loud Backfire sound from Sebring Z4 xos
that sound rocks. std exhaust u normally dun get it...cos the cats n the big air flow muff will clean off any unburn fuel. after mkt exhaust always smaller, lighter...n doesnt restrict back pressure....hence u will get unburned fuel detonating in the heat...thats how u get the pops. mine sounds like mega lao sai on some days....
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