From what I've read on other post, ( correct me if I'm wrong) you motor needs to be tricked out before you see any real gains with an air box. I think there is info on here in some historic threads or was it speedzilla? I can't recall. That moriwaki box is the way to go if really want the endurance tank too. The real gains from an airbox mod is real just the ounces and bling factor IMO...
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2001 rc51 upgraded
1999 vtr 1000 "superhawk" sold
2006 650R Ninja sold