Found a 2017 I would like to purchase from a dealership, but when I test drove a CEL came on. Asking about it, turns out an unknown aftermarket exhaust is on it, and doesnt have a cat on the back. Apparently it does have a high flow cat further up. Dealer says they are going to take it to a dyno and have the ecu tuned to get rid of CEL. Also noticed when starting a awd warning comes up that says it needs checked. Dealer says this is related to the cat CEL, and will also be fixed. Price is okay and drives totally fine. If this exhaust was oem I would already own it, but I live in Massachusetts and am subject to annual inspections. Anyone have insight on whether this ecu tune/flash is going to cause red flags on inspections, or prevent ford dealer from performing any work on the car? Dealer said a shop wouldnt be able to tell anything was done to the ecu, but we all know dealers will say whatever it takes to get the sale.