Very hard to laugh at federal law, especially once their account has been cleaned out by a good lawyer who doesn't see the humor.
What I said, as well as the MM warranty act, is that if the damage is caused by the aftermarket accessory, they will NOT cover that repair...it will NOT, however, void your warranty. I believe that if you do install a tuner and have engine failure for any reason, it would be very difficult, if not impossible to prove that it was NOT the tuner that did it...
The only point I was trying to make is that they cannot void a warranty due to aftermarket accessories...it's a federal law...