Quote:
Originally Posted by B-R-Z
I'm mainly trying to a) Not have a CEL and b) Not mess up my car by my ECU trying to correct the air\fuel ratio based on the o2 readings. Maybe I can have the shop cut the factory cat out of my header and put it in my front-pipe? Just kidding (kind of) but I really want to figure this out.
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I'm not sure what you're trying to avoid - you're going to want to get a tune for the header anyway to maximize the benefit so that should address the ECU and CEL for you.
Are you trying to get by without a tune? If so, you'll need some kind of defouler setup to trick the o2 sensor and avoid CEL. That's a lot less involved than trying to move a cat and sensors around to another part of the exhaust system.