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I just checked youtube and it seems like you have some options there to listen to. I know sometimes the sound isn't the best but it's worth a shot.
 

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I know that you have to disable the AFM or else it'll sound like a Jake Brake
 

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My son in law just straight piped his 08 5.3. And I think it sounds like crap.buy a good name straight throw exhaust,a much better way to go.the AFM on those trucks makes a straight pipe sound like crap.but that's just my two cents
 
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