ive never rode one, or seen the powergains from a dyno or anything. but ive seen them set up on quads at races and stuff and to me they just look really cheesy.
of course this could of been on how the people put it on also
i would just get a HMF for your 400ex
Rico Jr.'s #06
Red 400 and FIddy R
HRC kit
AC PROPEGS
ASV Clutch Perch
Maier Numberplate and kill switch
Unbolted Fenders
Dropped a tooth in the front
K&N W/ Red Outerwears
Spider Grips- Red and Black
Yellow 04 400ex
-Few Mods
Rico Sr.'s
Special Ed. 05 Banshee
- few mods