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Old 04-06-2017, 08:33 AM   #2
2009BLACKSI's Avatar
Join Date: Jun 2009
Location: Arizona
Posts: 337
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I have a Y8 swap in my CX hatch. The primary 02 sensor is at the end of the exhaust manifold/header. Since your primary o2 sensor is in the front with the integrated cat/exhaust manifold the wires would probably need to be extended if you convert everything to EX exhaust. I was able to buy an extension harness for $20 on amazon when I wanted a little bit more length. This would probably work for you. The only thing is the EX exhaust manifold does not have a cat so you would need one and have it welded by an exhaust shop. I had a cat welded up for $260 and a secondary 02 sensor was about $120 from autozone.
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