"The simple answer is probably the right one."

Boy I had to learn this the hard way. So for months and months of owning my LS there has always been a hard vibration under WOT acceleration.

I've changed axles, numerous alignments, motor mounts, etc.

And the culprit? WRONG SIZED TIRES ON FRONT!!!11!

That's right, 205/55 on driver and 205/50 on passenger! So a quick rotation and BAM! Problem solved, learn from my mistakes everyone.

-K