VEC1 doesn't tell your PCM everything is fine behind where your cats use to be. Only the simms can do that.
Get the VEC1 so you can tune the mods you've done including the cat delete.
Set em and forget em until either you do other mods or drive in a drastically different climate/altitude.
You can either use a dyno or seat of your pants to set. I used the set of my pants. But I can give you some basic starting points if and when you get one my fellow canuck!
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