I own a 99 Accord EX cpe. I bought this aftermarket header from online and now (like 4 months later) I get the check engine light. I went to Discount Auto & have it read and the code says my Bank 1 oxygen sensor is bad and my cat. convo is bad too. My question is if I replace this sensor and maybe both of them (Banks 1+2) AND get a high-flow replacement cat, could i still have probs b/c the header is the real prob. ?? Help me out, thanks.