I think you will need to get a camber kit. One of my buddies has a Honda Accord & once he lowered it he noticed a slight bow in his rear wheels. I haven't heard of any thing with the PT but I haven't been on this forum long.
Check out this link. Do a search too, there may be a lot of posts on this topic already.
http://www.drivewire.com/performance...gnmentkit.html