What would be the best pipe to put on my KFX400? People have told me a full system CT pipe but I wanted to see if any one elese had an opionion.

 

This has been beaten to death. Doa search if you want the BS. If you want the truth here it is:
There is not that much difference in the pipes. CT,WB, DMC, LRD, Pro Circuit, Yosh, FMF, they are all with in .5hp of each. All the piped open op the exhaust and make it flow alot better. I have LRD, I like it,I would strongly recommend it, but I am not saying it is the only way to go.
What brand do you like?
What look do you like?
Get that one, you will love it.
Get the pro flow kit and jet it, that all she needs.

 

Yes what sandneck said is true, they all perform about the same just make sure you get the jetting is dialed in. Last factor is :
Which can you get for the best price!?

 

I have a CT pipe, I am very happy with it.
fits good and looks good.
It came with a Dynojet kit(needle and jets)
Not to loud either.

 

When I bought my wife her KFX400 I bought it with a White Bros. R Series pipe. It sounds great. The only thing I don't like is that there are six screws to remove the spark arrestor.

Since I don't ride it, I haven't played with the jetting. The dealer said leave the jetting stock????? I have a uni filter installed but no airbox mods. All of our riding is in the Oregon dunes. Should I leave the jets stock or what? Can I take the lid of and put one of those prefilter socks around the Uni?

Thanks