Quote:
Originally Posted by DarthFader
Just some thoughts:
There will be more NVH moving from M2 to 435 but steering wheel and seat vibration shouldn't be that noticeable. Perhaps there's a tire slightly out of balance.
If the previous owner put a short shift kit in, that will usually cause some increased NVH and more vibration at the shift knob than stock.
If you find that a short shift kit was installed, perhaps the drive shaft wasn't installed exactly right which could cause a vibration through seat.
I would hope you could sort this out.
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Thanks for the input. I believe the car is not modified. I had it on the lift to inspect the underbody and the exhaust. Everything seems to be untouched, and all the M Performance carbon fiber parts (mirror cap, diffuser and etc) has OEM label on it. Besides the MPE, I would assume the previous owner spent his/her budget mostly on the cosmetic parts. Also, the car is a lease return.