Ya, i'd do it if it could produce 10 hp rear wheel. Everylittle bit helps. But I think that is a stretch.

 

Yes, its probably ten at the crank, not the wheels.
Never dynoed it to be sure though. Might be as low as 5-7hp

 

i never really felt (but dyno) any hp improvement. it did seem to free the motor up a little. seems like it helped it "rap up" quicker.

to me, the e-fan mod was kinda a dissappointing mod.its one of those mods i wouldnt waste my time or money on if i was to do it again.