Quote:
Originally Posted by teamred
I'm going to be installing my Avo cat less front pipe and Perrin over pipe in a couple days And am wondering if the cat less front pipe will cause any problems with the o2 sensors
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Both o2 sensors are in the header, so no. 1 precat, 1 post cat. Hence why everyone gets a CEL with a catless header without using a spacer or a proper tune.