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Posted

Hi I have a 2003 Gmc 2500hd with a 6.0 gas engine. I put long tube headers on it and flow masters and took off the cats. The headers don't have holes for the o2 sensors. Do I need the o2 sensors or can I run it without them?

Posted

You need your pre-cat sensors for it to run properly. Post cat can be tuned out

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