Quote:
Originally Posted by 18ss376
Will headers & cats cause a CEL with no tune?
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Every time. You may not get it immediately, took my car a month or so to pop up, but you will eventually get a CEL with headers and no tune. The primary reason is that the sensors are moved from their factory locations so they have a delay in the readings. Additionally, whether you go with high flow cats or catless pipes the secondary sensors will read differently than factory because there is increased flow. This too will cause a CEL eventually.