I have an 04 Scrambler and I just added WB e-series and a K&N Filter, no jetting required with all discs in from factory.
I also added a 12 tooth front sproket to replace the 13 tooth and the front end comes up a little easier. I like it.

I made these mods a week ago and have yet to take it out to the trails due to rain and time restraints.
Im going this weekend to try it out, I have some new BIGGER type c wheels and tires due to arrive this week also.

I may have to add a clutch kit before it is all over.

I want more low end and mid range since we do more mud and trail riding, so now I have to figure out what exactly I need to do with the clutch set up.

Hope this helps

 

Hey guys.....I'm the buddy[img]i/expressions/face-icon-small-happy.gif[/img]....Thanks for all the advise, I bought the White Bros. Slip on, put it on last weekend and the gains are great!! I am extremely happy with the power increase and the sound! Not too loud, but pretty tough.

Thanks again for all the posts/advice!