perf shift makes a big difference in how the car shifts, you can have you pcm tuned to up the line pressure in your trans, and firm up the shifts.

i think i did read somewhere that you can wire the button up but you need to put the wires into the pcm by pining it into the harness plug i believe. there was a write up some where.

i think charlie the van man swapped over the perf shift button into the mini van.