You don't need to mess with removing the shift handel from the factory rod. That assembly just bolts on. Unless you have strong wrists, the street version keeps the height of the shifter hadel closer to stock. The Race version, albeit cheaper, puts the handel very low. It also removes leverage.
I have the street version, bitchen'!
BTW: The stock shifter was leaking. I thought it was the rear seal, but it was leaking on the shifter gasket. The GMM has a nice 'O'Ring counter sunk into the base that sealed it up, no more leak.