http://www.clubgpstore.com/itemview.asp?itemid=89

i read for the pcm im getting i need to do a modification to the wiring harness for the shifting features to be enabled? what this all about and where does it need to be modified?
already read the 98s had different maf tables than the 99s.

Doesn't your car have the shift perf button on the shifter?
I thought it was just the 04+ models that came without the shift perf.

I don't have perf shift equipped. I have a 00 GT.

How to add Performance shift back into your 98 - 2002 GT/SE, and 2000 - 2002 GTP:
Following these instructions you should be able to add a performance shift switch to any 98-2002 GT/SE or 2001-2002 GTP equipped with a Digital Horsepower PCM.
Parts Required:
1. About 10 Feet of dark blue wire 16/18 Gauge Preferably, use your own judgment.
2a. A Shift knob from a 97-2000 GTP (GM part #10224212)
2b. OR any type of "On / Off" switch.
3. Packard Electronics FEMALE Connector Pins (GM part #12084913) Sold in Strips of 5.
4. A DHP reprogrammed PCM
5. Misc. Wire connecting supplies
Instructions:
1. Disconnect your battery
2. Remove your air box, locate your PCM and remove both connectors, this will ease the job immensely.
3. Locate Connector 2 on the PCM that will be the Clear one NOT the blue one.
4. Lift off the gray covers covering the wiring you may have to cut off some tie wraps to do so.
5. Locate Pin Number 21 or lack there of it will be a empty slot, take a drillbit or a punch and punch a SMALL hole in the rubber covering it.
6. Take one of the FEMALE pins and crimp the Dark blue wire onto it at the end. You may want to solder this connection as well to avoid any problems in the future.
7. Push the Pin and wire assembly into the whole you just made in the rubber grommet at pin 21 on the clear connector. MAKE SURE it seats fully, it may take 2 or so tries to get it right.
8. Position the wire to run with the rest of them out of the connector and into the loom if possible, if not grab some loom and cover it, a factory appearance never hurt anyone.
9. Take the aforementioned blue wire, now connected to pin 21 on your PCM and run it into the cabin either way you see fit..
10a. Run the wire up into the console and up to your NEW shift knob with switch, attach the blue wire to the RED wire of the switch using whatever means you like, solder/butt connectors ect, take the black wire on the shift boot and put a knurled ground loop on it and attach it to the upper left hand corner bolt that holds down your shifter.
10b. If using a simple switch, solder the Blue wire to one prong, and solder the ground wire to the other.
11. Reverse all procedures and button up all your trim and under hood accessories.
{IMG} Now on a 99-2002 GT/SE and on 2001-2002 GTP's equipped with a Trip computer the DIC should show the status of the Performance Shift switch.
{IMG} On a 98 GT/SE, and a 99-2002 GT/SE equipped with a base level DIC, there is a little more wiring required.