I have a aftermarket exhaust system can I get a performance cat to pass DEQ???

Seriously?

Yeah, seriously - that’s who supplied the exhaust system so they should have / know what you need for that exhaust system .. Furthermore without more modification specs we can’t recommend a compatible catalytic converter. There’s always MagnsFlow - Flowmaster etc.. but the modifications specifications are critical information - plus the question of the cel.. Actually by the letter of the law the exhaust system from engine to the cat can’t be legally modified. Good luck!

Ok thank you