When I first got my LTR, first thing was to take off the lid, sparky, and cherry bomb. It made a very noticable difference. Now, I took off the end cap off the stock pipe to see what it would do and I think it gives me more bottom end. Also tried running it without the seat and ran even stronger. Will this make it go lean? For information, I was racing against a yfz450 that was modded. (full pipe, cam mod, hi-comp piston, gytr filter and cdi box) With regular primary mods on my ltr, he would beat me with about 1 quad length. After taking off the seat and end cap, I would be right with him and slightly pull him on 5th. I know, I know, I should get a pipe soon, so......