Hey Motorbikersx, I've been thinking of one of these too lately (tank risers). When I removed the rubber air dam in front of the air filter, and got a bit more intake space between the tank and intake, there was a small but noticeable power increase, with a lot more intake noise. More space again with a tank riser might increase power more. An cheap enough mod to try, maybe carve them out of urethane leaf spring bushes?
In my opinion, a slightly lifted front of tank looks great;half a million Sportster owners can't be wrong! Well they might, but they're not going to admit it. Heres mine.........
Whoops, need to compress it more before adding it. I'll be back later.
2013 Hard Ball
Stage 1 mufflers
K&N air filter
Rubber air dam removed
Whole lot of extra cable ties, shrinkwrap and tape on loom
Hard chrome spherical joints in back
Hammer front guard
Wide Glide fork boots