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I have the AFX UDP. It didnt add any power per say but it did make a difference into how the engine responded....revs faster & smoother from my ol' but dyno. I think its a great little mod. Me and my father installed it in under an hour.

I also have the Bomz CAI. Same thing...didnt add power but defenately (sp) let the eninge breathe a little better and helped with the smothness of the engine in higher RPM's....oh, and it added more noise. I think thats the biggest outcome of this mod is giving your engine a little more growl. ;) It drowns out my Borla above 6K Rpm....

Hope that helps.