What psi to run...
I always do a quick alignment on my car with new tires. Probably cost you $75-$100 bucks to have a shop do it for you. Just do it and make sure everything is where it should be... Especially if you're moving up to the 18" wheels.
I run the same setup as you, and I run 34psi all the way around. You can run 35/36 up front, but I would go no more than that. Just be sure to check periodically for even tire wear, as well as signs of chopping.
If you've recently upgraded in rim diameter, or any other suspension changes... Now is a good time for an alignment.




