The main differences between the two is the hpi one uses plastic internal gears and uses your stock owb.The tiger drive is all metal geared and uses it's own owb that will last forever unlike the hpi one.The tiger drive will come with everything needed except the drill,hpi one comes with everything but you use your stock owb for it to work.Both work but the tiger drive is a put it on and forget about it,hpi one will work for awhile then owb issues will arise.Hpi one is 87117 I will try to find a tiger drive one on the bay and send you a link.