>"Can you easily fit dual-exhaust from a manufacturer OTHER than PTeazer?"
Yes other manufacturers will fit just fine on the PTeazer Retro Roll Pan, the Illusion Rear Bumper now thats a different story.
BTW Race and Street has the best price going for the "Retro Roll Pan" right now plus free shipping.
Check it out:
PT Cruiser Roll Pan - Pteazer Retro FREE SHIP: Race and Street