for the custom tunes thet need to know all of the modifications that you have done and thenthey will write a tune for that apllication the sct tuner has a pretty good tune that comes with it when you do major mods such as cams,heads or a supercharger you would need to have the car dyno tuned but the canned tune will workfine for boltons
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2003 gt auto , CAI,UDP'S,BAMACHIPS Custom Tune, Accufab 70mm TB and plenum,Eibach Pro Springs,4;10 Gears,Custom XPipe,40series Flowmasters,MSD blaster COPs
Your tune is based on the calibration code of the PCM so it doesn't matter where you buy the SCT XCal in North America (Canada or US). There's a sticker on the door but you are better using the sticker on the PCM (passenger footwell). Mine is SXA2, for reference. Yours might be something like NUX2, etc.
Chris
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* 98 GT w/4R70W, black/grey
Comp Cams XE268H's, PI intake (Livernois kit), MAC CAI, Accufab 75 mm TB & plenum, Steeda pulleys, SCT ProRacer tuning, Steeda springs, MM c/c, FRPP 3.73 gears, SVO girdle, Denny's Driveshafts 3" HD d/s, J-mod, FRPP trans cooler, VRS catted X, MagnaFlow exhaust, Hawk HPS pads, OEM Cobra headlights, fog & tail light re-wire, some other stuff…
SCT tuner questions 
2003 gt auto , CAI,UDP'S,BAMACHIPS Custom Tune, Accufab 70mm TB and plenum,Eibach Pro Springs,4;10 Gears,Custom XPipe,40series Flowmasters,MSD blaster COPs
