Might be useful if you're running shorty straight pipes. Even so, I don't like to see the restriction that close to the engine. I think these are being sold as a bandaid for the HD guy who bought straights cuz his buddy did. That sort of thing probably happens a lot in HD-ville.

Jack

'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy