I just had my drive unit replaced on June 29th.
"ASY,P-TRAIN,RMN,MDLS,SPORT,CMC,HS
(1025598-00-P)"
I'm noticing the car feels weaker on pedal response when I floor it or just attempt bursts of speed to get around bad drivers on highways. I took the car into service to have weird rattling looked at underneath the car and got a p85 as a loaner. the response of that car pins me to the seat and my wife confirmed that this is how my car felt when I first got it as a CPO in January 2016.
PURSUE THIS - IT HAPPENED TO ME!
I had my third drive unit replacement in January of 2015. After that swap, my P85 felt like a S85 - no snappy acceleration, pedal response was not as snappy as before, and overall the car felt sluggish. Since the swap I've driven several P85 loaners and they all had that "push you back into your seat" acceleration that my car seemed to have lost.
I contacted service and asked them about this, but in every instance they said they checked it out and it feels fine. The last time a service technician said that he honestly wouldn't even know where to begin diagnosing an issue like this. So I just settled into believing it was all in my head.
Lo and behold, that drive unit developed an electrical buzzing noise and service swapped it out a month ago at my last annual. I received a P-revision unit. I asked for Q but they said Qs were not for P cars, and they would give me the latest. Well, my car now has its snappy acceleration back like it did when it was new!
I've posted here previously about my car not feeling as fast as it was originally, but nobody else seemed to have the same issue and I've googled it extensively and no similar reports pop up anywhere. But now that you mentioned it, I wanted to mention my similar experience. There is something going on. Not all replacement drive units are the same, even though they are for "performance" cars, and some are faster than others.
This should be concerning.