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Discussion Starter · #1 ·
i recenly installed an 4" cat delete downpipe and afe turbo inlet and keep popping an engine code. the truck has driven fine for about 10k with the other mods. will get codes tomorrow, yes i unplugged the batteries after the mod, its happenes in town when im driving the truck easy, dont know where to start
 

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Discussion Starter · #3 ·
my buddy runs 4" straight and has never had a problem, lly also
 
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