You can't. Don't worry about it, it's not that big of a deal.

As for your problem. I replied in your other thread.

 

Your car should have Z rated tires if you have 17's which can handle up to 149mph. The 96/97's didn't have a top speed limiter. The 98's did however. I had a 97gt and it wouldn't budge over 138mph. That's as fast as the car can go with the power the motor has. The motor just doesn't have neough gut to make the car go any faster through the air that it's pushing. I had 3:27's in that car stock. My boy had 2:73's and his car would do the same, actually only 137mph. No cuting off so it's not a speed limitor. The car would just sit there as that's all it could do. Boy let me tell ya, it took a looooooooong time to get there! Like 4 miles to be exact!...lol My cobra will hit that 4th gear within 10 secods after shifting from 3rd. You really have no need and I strongly reccomend no going that fast in a completely stock GT. The car is just not built to handle those sustained speeds. The car is all over the place and it feels very unstable. The only way is to upgrade all suspension components before it feels remotely stable.

 

alright thanks for the understanding and i saw your answer and thats what i figured. because i have seen many newer gts that can go well over 120.

 

ya i have an 01 GT and wen i hit 120 there was plenty of room left and it felt like i was doing 60 so idk

 

yeah so i dont understand either i think my year just has a governor on it so im gonna have to look into disabling it

 

ive had mine to 137 with no problems. does the 99-04 gts have a speed limiter????

 

we must not, or its high... ive seen 150... tonight actually

 

ive had mine to 145, 120 doesnt take that long to get to but from 120 - 145 took a while. good luck moding
ps. dont forget brakes and suspension

 

thanks and yeah suspension and brakes is on my list of priorities along with the other engine mods lol

 

Look at theB-post sticker on the driver's side; if the car came from the factory with Z-rated tires it will say so on the sticker and the speed-limiter will not be set, if it did not have speed rated tires the limiter will be set at 120 MPH.