You would have to get a reprogrammed PCM. DHP offers a reprogrammed PCM for the 2000+ SSEi'*, it is $450. It will change shift points (downshift & upshift points), fuel tables, and lots of things like that. From what I have heard about the DHP PCM, for the $450 they will program the PCM for anything you want done to it, say you want the shiftpoints raised so it shifts at 6200 instead of 6000, they can do that. Say you want 20 degrees of timing advance instead of 17, they can also do that. I think if you got a DHP you would be quite suprised at what it does to the cars shifting and the power boost you get from it.
There is also an ASE chip available, but I don't know much about it, it may do some of those things also. I will let someone like 2000SilverBullet or somebody that has that chip tell you about that.
1990 Maroon Grand Prix STE McLaren 3.1 Intercooled Turbo, 14.695 @ 94.49 on 12psi before cam/heads/etc.
1990 Bright Red Grand Prix McLaren 3.1 Intercooled Turbo, 14.819 @ 92.72, 189whp
1999 Grand Prix GT 9.75:1|K&N|160 tstat|No Ubend/Cat/Res|UD Pulleys|Ported M90/TB/Heads|XPZ|2.55"|Pacesetters|Stage 2 I/C. 12.442 @ 112.78
2000 Blue Bonneville SSEi Supercharged Gutted Airbox|K&N|3.4"|1.9'*|WP Pulley|Custom DHP|180*stat|41932'*|No Cat. 14.681 @ 94.80
2002 Dark Cherry Grand Prix GTP Supercharged & Intercooled
12.084 @ 114.38 w/1.743 60', 315.6whp, Fastest Stock Cam M90 GTP!
NOW XP CAMMED, 340.6whp with XP, stock heads, Gen 3 M90, 11.984 @ 115.84 w/1.750 60'!
Most HP Stock Heads Gen 3 M90 GTP!
2004 Red Monte SS Supercharged K&N|3.4 Pulley|1.9'*|180*stat|41919 plugs|3" dp|No cat/ubend|DHP|Shift Kit. 14.2 @ 98
GOT BOOST??? Friends dont let friends drive stock!