Looks like Edelbrock is looking into providing exhaust for PT-GT's.
If you are in the area, why not apply? Theirs is likely to be CARB approved.
http://www.edelbrock.com/automotive/...eded_list.html
Year Make Model Product to be Developed
2004 Chrysler PT Cruiser 2.4L Cyl., and PT Cruiser Turbo Test fit shorty header & catback systems