What is the diffrence between helical LSD and a Kaaz 1.5-way LSD besides $500 this might be a noob question but i thank the help.

a helical diff and a clutch type (the 1.5) lock in different ways. the helical is always looking for the wheel with more traction to give power, and the clutch type will simply lock under the right circumstance. 2 way LSDs are better for drifting since they lock on deceleration, but the 1.5 will give you the best of both worlds in terms of handling and locking capability. a kaaz clutch type lsd for example will also be able to take a much bigger beating than a helical. best diff to use in my opinion.

Aftermarket diff will be noisy so get ready for it, but anyways, the HLSD won't lock if one wheel is off the ground, as simple as that, so get a clutch type.