There's currently a forum discussing the intricacies of swapping a lower-ratio diff to gain mucho acceleration potential...

I would think K&N and chip definately (do post search to see if a chip is avail) and if you're fanatic, diff and exhaust.

Oh - and from what I hear, best thing you can do is better suspension, wheels and tires.

I've been whining about acquiring one of these for awhile (wife is at the front of the line for her MDX tho). Interested in what you end up doing so keep thread informed.