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so it just needs to be collected in the exhaust manifold all 4 cylinders into one area so that the o2 sensor can read it. so you gutted the cat and it works great? I've got an HF exhaust manifold but I'm wondering if an EG manifold work with the downpipe? ice on ebay I could buy an HF cat converter for much cheaper than a vx cat converter. both the same size engine so I see why I wouldn't. here is a picture of the EG DX sedan exhaust manifold and downpipe with the o2 sensor.
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