bullet cats vs stock?
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Joined: Jan 2008
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bullet cats vs stock?
i was thinking about removing my cats but then heard that it would not only turn my check engine light on but would eventually screw up my computer. So i was told to replace my cats with some dynomax bullet cat converter. Would this make a diff? If so what will it do?
Le Mans Master
Joined: Jan 2003
Posts: 8,596
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From: Portland Oregon
It won't screw up your PCM, but will set a DTC. Even if you replace the CATs with a set of high flow CATs, you may still set a DTC. The reason is that the replacement CATs are not of the same ceramic substrate as the stockers and they are not near as efficient as the stockers, they will flow more plain and simple because a typical high flow metallic substrate CAT has a 200 cell per sq inch count vs a 100 cell per sq inch of the stock CATs. So because they are not as efficient as a stock CAT the PCM sees this via the post CAT o2 sensor and reports a CAT efficiency DTC. Unless you have some substaintial modifications such as headers, CAI etc, there will be NO GAINS from replacing the CATs.
