Lund is very experienced with these crate motors. I've used them several times and was happy with the expertise and results. The feedback about the crate motor not having (or programmed for) post cat O2 sensors is exactly correct. Also those mini cats are much closer to the engine than on a stock setup. So I would at least consider what he's saying. My guess is your engine would tune OK and depending on how you're driving it, may not experience the cats getting hot and/or collapsing. I have zero experience with them. But it's sure something I would pay attention to. Little bit of Monday morning quarterback, but I've never been a fan of cats for reducing the noise level. Also, my two Coyote builds without cats have zero issues with exhaust smell short of putting your face up against the outlet. No lingering smell in the garage. None whatsoever from the cockpit. The combustion is very controlled and clean. But pretty sure I said that before.