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I have the same problem with the GS downpipe on my Viggen. I have heard that this problem stems ONLY from the fact that the cat is relocated further downstream in the exhaust than even the rear-most one on the factory setup (no longer directly underneath the oil pan). This, and the fact that it has less restriction, allow for a cooler-operating cat, and doesn't reach the optimum temperature when you are driving the car easily. I only trip 0420 when I'm driving very gently (ie. flat constant speed freeway drives).
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