Quote: Originally Posted by yz125rider21
your quad will be the same if you just get the pcIII because its tuned from factory best it gets unless you add mods because it is fuel injection....but from what I read a slip on is a waste of money and only for sound
Not true. You get very slightly more HP out of a full system, but the majority of the restriction in the stock system is in the muffler itself; it's baffled. The aftermarket headers are just stepped, which gives you slightly better flow.
Also, for those that think that running the stock pipe with the baffle out will make it sound better... See: Youtube Video comparison (I'm obviously the one on the black KFX. Blue is my buddy Daryl on his Craptor 660, red and black is my buddy Simon on his TRX450):
Without the Sparky
With a Motoworks SR-4
'08 KFX 450r, Black.
Motoworks SR-4, CFM Aluminum intake box/tube, Custom EHS lid, K&N filter, ProCom ECU, Fasst Flexx bars, Elka System 5 stabilizer, black Pro Armor Fat Peg nerfs, black Pro Armor Dominator bumper, Pro Armor kill switch, Pro Armor swing arm skid, JnJ frame/a-arm skids, Pro Armor billet case saver, Pro Armor billet shifter, 15 tooth sprocket, ITP Holeshot HDs, Factory Effex Metal Mulisha graphics