hello i just got my 2008 450er broke in and i am concidering a hrc kit. i don't think i will have any problem installing it, but i was wondering if this kit is going to affect the reliability of my bike? and i often drag race around the house and trail ride. will i notice a conciderable power difference? thanks for any replies

 

One of the first mods I made to my 450r was a hrc kit. yes the power was noticed immediately. If you want power its the way to go I also went with an aftermarket exhaust and filter kit. If I had to do over in my situation I think I would've went suspension first and power later. my .02cents
http://www.rockinhorseweb.com/hrc_po...it_install.htm

 

It nets you power overall, but mostly on the top end. When the kit first came out, they were saying you would need more frequent rebuilds, but I have a bunch of friends with high hours on their engines and nobody needing a rebuild yet.

The fastest R I know of, has nothing but the HRC kit, and opened up stock muffler.

 

do they make a hrc kit for the 400ex???