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All Z-rated cars would've been custom ordered by someone willing to wait or a dealer with a custom allocation to burn. Not a very prevalent feature unfortunately, though I don't know where you'd go 150 mph.
 

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but its is allways nice to know you have it if you want it.i have had mine up to 115 and i belive im good for now,but it does bring back the good old days when the pc in your car worked for you and not somebody eles.on star,gps,sat.radio,are all cool but sometimes i dont want to be radar,and i may want to speed. cheers to the 94 etc they had it right that year indeed
 

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1999 Black and Tan STS
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753 Posts
My 99 is z-rated, and yet to see over 135. (that was on 495 heading to Gillette) So my last 2 sets of tire were H rated, for money and convenience. No one seems to carry the Z tires in that size...
 
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