There's a company out called Weapon R. They make an intake for the PT Cruiser. It seems to be pretty high quality, and has a foam filter which is supposed to provide even more air.
http://www.abtivan.com/weaponr/weapo...mschrysler.htm
This looks like a reputable tuner shop, they have a store set up on E-bay, and they sell the Weapon R intake for the PT Cruiser. $105 plus shipping isn't that bad at all if the product is what they say it is, and what TPR says as well. Take a look.