If you use the programmer on a LMM you can install a aftermarket exhaust with no filter and the truck 🛻 will not have the engine light come or go into limp mode it does not disable the stock exhaust filter
I used it on my LMM for about 100k miles after my exhaust filter fell off my truck 🛻 onto my garage floor and I installed a magnaflow down pipe back exhaust
I gained 2 miles per gallon and my exhaust gas temps was much lower when towing