runnin a 1.8 ecu may get rid of your cel it only needs to run on one o2 sensor ,mine runs on the rear oxy sensor and i dont have a cel anymore . i dont have a obx header but a friend of mine does and he had the cel on he then switched to a 1.8 revb ecu and the light went out and has been out ever since

 

Thanks for the info dude, but if you read, I already have a Rev B 1.8 ECU. And I also have no CEL. There is no problem other than my car sounding like balls, and I ordered a 02 simulator anyways just in case.

 

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Um put in a high flow cat.
Thats how my setup was header-flex-cat-exhaust no cel