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So the A4 had a pre-cat exhaust leak and I was coughing on the soot, getting headaches etc so I'm sure it was filling the cabin with toxic carbon monoxide. In this episode I change the cat and downpipe as the flexi-joint was rusted through.
I also change the rocker cover gasket as it was leaking oil into the spark plug wells causing a misfire!
Safe to say it runs beautifully now in comparison.
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