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Had PS4S on my M4, which I recently traded for my M550i. I could still break them loose all the way through 4th gear, anytime I wanted. Just the nature of the beast, and one of the reasons I traded (those tires are expensive!). Drove M3 and M4 at Circuit of the Americas, and they are true beasts. However, when we did the drag race portion of the M track day, we used the M550i and launch control. Gotta be a reason BMW chose to do that.....no wheelspin, just an amazing launch. I believe that's why the 0-60 time is quicker for the M550i, the xdrive affords maximum traction for launching. I know I certainly have no regrets. BTW, loved the PS4S, they were the best tires I had on the M4. Planning to put them on my M550i, when the time comes.
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