I never had a problem with the stock Y........
Then I installed a Warpspeed Y this weekend, and removed all heat shields in the process.......
Now there is a violent vibration on acceleration, but it goes away once you get up to speed. I figure it has something to do with the flex in the car as you accelerate. Here's the thread I started earlier today if anyone is interrested......
http://forums.maxima.org/showthread....71#post5841871