So the previous owner swapped in a b16 into my 93ex he also installed and skunk2 intake manifold, not sure if that would effect this. I know basically what it does and that it should be mounted below my fuel rail. But why don't i have it, i just have the plug sitting there, is there any reason that this would be removed for performance or anything, i don't have a cel indicating any problem with it, like i would expect. Should I install one, how will not having this effect my engine. Thanks for the help