Quote:
Originally Posted by kpgray
To get the Higher speed limiter, the vehicle must have been originally ordered with "Mixed Performance Tires" or "Mixed Performance Summer Tires." This automatically adds the "Increased Top Speed Limiter" raising the limit to 155 MPH. This gives you the 8.0" wide front and 8.5" wide rear tires. This is an "840" option on RWD and "ZRT" option on the xDrive. It is usually found with M-Sport option as it has the largest selection of Rim choices with Performance Tires but some Sport versions do exist but are more difficult to find. If you find 19" OEM rims installed, these are most likely to have the higher speed limiter. The dealer should be able to find out for you to be sure.
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I ordered a 340 with x drive and it has the 840 option. If think the zrt option is of they remove the limiter completely.