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Please correct me if i'm wrong, but the catback HKS Hi-Power Dual exhaust doesn't need an O2 sim? Is there even an O2 sensor in the catback part of the exhaust?
no, you don't need to modify a catback because it's only behind the cat. the cat is what the O2 sensor plugs in to, so if you change that to a test pipe, then you'd need an O2 simulator to go in to that.