its depends on the truck i have heard of some throwing codes when you remove the cat and some not. mine has been straight piped for a while and only threw a code once but i was towing quite a bit. wost case scenereo you have to clear a code or you can just buy a finger stik and be done with it
mine throws a code sometimes when i tow with my predator on 85hp or if im flogging it on 120hp but no big deal just plug it in and clear it. eventually ill get tired of doing this and finger stick it and or block the plate probably
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