http://forums.overlander.com.au/view...r=asc&start=15 there is some reading, appears to not really work (bottom of that page a dude reckons he dyno his truck) seems like ur better off spending 160 bux on air filter/exhaust mod.
d_slayer: u say u got 40km more with the hiclone on the highway, is this compared to city driving without the hiclone or compared to highway driving without the hiclone?