first thing to do to the KFX 400

[Dill Pickle]

i just picked mine up today.

its really fast stock, but i am going to be adding a pipe jet kit and kn air filter.

i was wondering what the best full exhaust system for it is. most hp and low end gains

thanks

[alberndt]

My buddy has an lrd full kit and is really happy with it. Its pretty loud, sounds good

[beak7707]

HMF would be a good choice. If you dont plan on doing any motor mods like cams and piston, the slip on would be fine.

[lsittingbull]

HMF, Bill Ballance edition?

[jbfoco]

Sparks is my first choice but HMF and Yoshi are all great pipes

A 13 tooth front sprocket really helps on a near stock bike

[Matt756]

hmf

[popo]

Send your Z to me with a credit card. I can fix it up real nice for you. :D

[Matt756]

Originally posted by popo
Send your Z to me with a credit card. I can fix it up real nice for you. :D
u have the nicest quad i ever seen

[elliptic]

I like my HMF alot, but hear alot of good things about ct racing and sparks

[Matt756]

SPARKS WOULDNT BE A BAD CHOICE EITHER THOUGH

[jtsurfer]

In the exhaust shootout for the LT-Z400 and KFX400 the Pro Circuit won for the best bottom end and it also reached its peak power the quickest. The Ct had the most peak power overall.

[batgeek]

that was a crap shoot-out...

no air box mods were done to any of the quads. also, jetting was done as per recommended by the manufacturer on the documentation supplied. if none was supplied, the manufacturer was not called and they guessed on the jet setting.

differing numbers are achievable by every one of those pipes with correct jetting and air box modifications.

fyi - i run a CT Sonic full system with a 160 main/stock pilot and Alba Max Flow filter adapter with a K&N filter.

[Out_Sider]

i'd have to say Alba ;)

[Shuee_400]

Yoshi

[shaff107]

LRD all the way. I promise call mike at LRD he will tell u everything u could ever want to know about the KFX he knows his stuff and will talk with all day about whatever!

[shaff107]

i have a 400ex but i had a yoshi before my LRD and my yoshi just didnt give me the power that it should have. the LRD brought my motor to life i love it. im just guessing but i would think that it would do the same as a CT or Sparks cuz they are pretty much the same pipe if the CT has a turn down. just my 2 cents

[Blakey]

Reinforce the frame to keep it from cracking..