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I think the whole thing is overated.
1) know one can give a definitive hp change so I'm going to bet there isn't one of significance. If you need a wind tunnel to test it, I'd say it pretty miniscule/
2) I did it, had to Micky mouse the loosened vent back in (Brad), and frankly as for sound, I could barely hear the difference with the top down (almost always)...certainly didn't turn the head of the hotty in the Honda next to me.
Maybe I'm numb, but to make a significant diff on both counts takes some heavier lifting than a plastic pipe.
Regards, PK
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