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So I know this is kinda' stupid question...i was just curious...I mean, it makes sense that it's the sound of the waste gate venting, but, I wasn't sure and just thought I'd check with y'all and confirm it's just a normal sound, although I've never heard any other p/u's do it, but, maybe ya' hafta be in the truck to hear it? Doesn't seem like anything else could make that sound.......
yup. excess air coming out of the 6637 as the engine drops revs.
you do not hear it with the stock air filter and air box in place. but it is loud as all hell with the 6637 in place.
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