Well My 91 z came with a borla catback. But didnt come with any of the plates to change the flowthrough.

Can I buy just the plates and gaskets? or am I out of luck? I checked borla's site but didnt find anything. Is there somewhere else to look?

 

try calling or Emailing Borla, im sure they are willing to just sell the plates if the system is already on the car,

another option would be to make your own, that way you can play with different size holes and what not, its not hard at all