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2018 Mazda3 Sport GT
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I have looked around and I can't seem to find the size of the inlet pipe on the RB exhaust. I see that the outlets are 2.375". Does anyone know the inlet pipe size?
 

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Between the racing beat and ultimate racing axle back, which is quieter? I have the UR but was considering the RB if it was more quiet, especially at around 2k rpm.
 

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People always say the RB mufflers are quiet, but they are noticeably louder than stock.
Relative to other axlebacks, RB is on the quiet side. Right where I want the 3. On older clunky cars, I'd probably go w/ something louder....to drown the rattles out.

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2018 Mazda 3 GT called Coffee.
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2,120 Posts
Racing Beat will be quieter than Ulimate Racing.
CK
 
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