Hi all,
I brought a HKS dump valve which came off a classic 97 impreza but i want to fit it to a 04 WRX, so need to change the adaptor plate. Where can I get an adaptor plate from and how do you seperate the old 1 off? Any help or advice thank you

 

Ebay. search subaru ssqv and im sure you'll come across a few.

to remove you need some circlip pliers to undo the retaining clip and it will just lift out