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I see a lot of talk about a Z-Rated STS that can go 'well-over' 150 miles per hour.. Is there a Z-Rated ETC that does the same? The "Z" rating would be noted on the tires. Right?
 

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The ETC had the option as well. The tires may have been replaced with non-Zrated during the car's life though.

Did a search at Caddyinfo and the surest way to check is the door jamb for the tire sticker, or under the spare tire well cover for the option code "QVF". "QVG" would denote the 130mph top speed.
 

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Or you can just look at the speed rating on the tire size sticker on the drivers door....

You could get the Z rated tires on the ETC also.....
 

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C'mon Sal, you should have done the functional test to find out what the speed limiter was. :D
 

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You mean, he didnt..... :confused:
 
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