Extremely loud. Imagine a straight piped HD. I wouldn't call it obnoxious, but I would call it extreme. No problems with stock air intake. If you change the intake, you'll need some kind of fuel management system. It will pop and backfire on 93 octane, but I heard it's better on 87. Haven't tried yet. I have my baffles out and love it.
I pulled the baffles out of my Cobra Sweeps and it's loud, just as loud as my Softail with no baffles! I was getting some backfiring occasionally, but it's gone after installing the Cobra FI2000 auto fuel programmer!
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