Here'* how you make a shift kit, save your money and make it yourself.
Making and Installing a shift kit. 4t65-hd transmission
Dropping the sub frame isn't to hard if you have a shop. Jack up the car as high as possible, support the car so the sub frame is free. Use long 2x4 and jack stands. Remove front wheels, undo the lower control arm ball joints. Remove axle on drivers side. Make sure all wire clips are removed from sub frame. Support engine from above with chain and a 4x4. Unbolt motor mounts on sub frame. Remove 2 bolts on steering rack, attack steering rack to exhaust manifold so it don't fall down. Remove power steering lines that are mounted to sub frame. Support with jacks. Remove bolts holding frame to car, then lower. Make sure you didn't miss any wires or pipes like transmission cooling lines. Make good time and you can have the SF out in about a hour.
You can then lower just the drivers side using a jack. It'* very tight with the brake lines. When just low enough, you can remove the side pan. The EPC solenoid is in there. I've done a few like this. The EPC is the big one on the front side of the valve body. You need a hook to pull out a clip, and it pulls right out, put new EPC in, replace clip and plug it in. Put side pan back on, torque to 18 foot pounds.