Ok, I'm seriously debating a SCT & one of elite diesel's EGR pipes. Now exactly how does this work... If you run a factory Flash, and have the EGR pipe/blocked off the CHECK ENGINE light comes on and they start sniffing around and find out why. So now you have the Programmer, and EGR modifications and no kitty cat. That makes me nervous. I don't want to pay for a water pump, or alternator that goes out b/c of these mods.... what is the best way to handle this?