will 225/40YR18 XL and 245/40YR18 michelin ps2 tires.. what does teh XL mean btw? i found this on tirerack

 

They'll fit, but your fender/tire gap is going to be much more pronounced and the car will look higher. 'XL' stands for extra load. If anything, i would do 245/40 all the way around.
-GP-

 

ya thats the prob... the ps2s dont have 45s.. they are all 35 or 40y.. how big is the diff between 45 and 40?

Bridgestone Potenza RE050A Pole Position these tires are ranked number 1 by tirerack

 

The RE050A PP's are very good tires. The PS2's will last a little bit longer though.
-GP-

 

The difference is 1" in Outer Diameter. You're right, the stupid SOBs don't have a 45 series tire. Since the original Pilot Sport was OEM, you'd think they would know better. 225/45/18 is a hard size to find in any brand. If it were me, and I was staying with the stock wheels. I would go with 245/40/18 in front and 245/45/18 or 255/45/18 in back. This would fit fine, maintain the stagger and reduce some of the understeer. You would have to go with a different brand of tire though. I like the Dunlop Sport Maxx.

However, if you're dead set to get the PS2s - You could put the 245/40/18 on the front and 255/40/18 on the back. You would still have a stagger, though it would only be 1/2", not the 1" stagger that's stock. I "think" the VDC would be OK with this. Also, the back would be 1/2" (2%) less in OD than stock. But, IMO, this combo should work.

Good Luck

Lou