I know you should technically get a HP gain if you remove the lid and rejet.... and people have done this and said they felt a difference.... but does anyone know of a dyno number, or better yet a website showing a dyno chart to prove just how much an increase you get???

 

I think dirt wheels did a test like this and have the results on their web site.

 

Don't know where its at but i have seen a few dyno runs and they say 1hp increase

 

yes DS did a pipe shoot-out...with and without airbox mods. Dyno charts for all the pipes were displayed...shootout was done using CT racings Dyno.