Buying a honda 400ex this Saturday wanna thro on a new exhaust I heard FMF slip ins were best for them bust wanna here a couple suggestions b4 I just go and do it? Also any other help on improving engine is appreciated.thanks

 

What noise level are you looking for? FMF makes a great slip-on as does yoshimura. I like those 2 brands over most of the others out there personally. I have a Sparks Racing exhaust on my 700xx and have nothing but great things to say about it but they only make full systems

 

HMF all day, best power best sound