i have narrowed it down to two pipes for my kodiak. either a white bros e series or an hmf. which one puts out the most horse power, and what would i have to do when i put these on? would i need a jet kit, or how would i rejet it?

 

It seems that everyone likes the HMF from what I have read. It is loud though, you can also get it with a quite core which supposedly when it is installed maintains most of its power. I haven't heard too much on the White Brothers pipe, I didn't think they made a pipe for the Kodiak? If you are switching from your stock muffler to an HMF you will have to re-jet, since you are also running a K&N.

Doing the stock exhaust mod is another option as well, and its a lot cheaper.