The Dasa exhaust is nice. You will gain a few extra HP and turn some heads. The Fuel ATV intake seems to be very popular.Two Brothers , HMF and Pro Circuit are our three biggest sellers for the KFX450 along with the FCI intake.. So far I haven't received a complaint about either system. If you have time you can give us a call and I can go more in depth with all the products available for the KFX450. 270-774-1982
KB Motorsports