I never would have believed that 2 psi tire pressure would make such a difference. I just got my 8 three days ago and have put over 250 mi., since. I read a thread this morning re: tire pressure affecting ride and "tracking" (can't remember the tech term), so I decided to check (cold, of course). All four were at 34.5 psi, so I lowered them to 32 (I have the stock 18's & tires). I drove the car all day today and noticed a significant difference. Rolling over small divots (manhole covers, cracks, etc.) is now much smoother and the left and right drifting has reduced a lot, too!. I'm glad because the tracking thing was starting to bug me a little.