do you know what a cam shaft is? the z400 motor is a dual over head cam, it has 1 camshaft for 2 intake valve and then another camshaft for 2 exhaust valves, they are better becasue theylet more air flow by keeping the vavles opened just a hair longer but then when ya ad the drz valve springs they are stiffer and they close the valves alot faster, the hotcams are the camshafts, i know people just get the intake and some just get both, i would get both, but thats me, they are great if you are looking to mod your motor a little adding hotcams and a dyna ignition it will bring the Z to life 
San Diego, CA
#71
04' Z400
alba jet kit, alba full pipe system, outerwear, k&n, alba pro flow billet adapter, alba chassis skid, alba kory ellis blue graphix, alba nerf bars, tag x5 bars, burgard +2 arms, AC racing bumper, OMF scoops, custom grill, custom grab bar, and sand star paddles all the way around with ITP t-9/s, front holeshot 20x6x10, and 18x10.5x9 kenda klaws, custom gussets, +2 custom steering stem, hella light, alba cdi, shockwears, front works w/out rezzies
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