mobile-menu-icon
GM Authority

Reply To: 2021 Sierra 1500 aftermarket part upgrades

#737875
Parts Man1
Participant

GM fan, putting the wrong spark plug can set a check engine and I really dont see and advantage to changing plugs. Like your other ideas and yes, the tuner can cancel the factory warranty

Subscribe to GM Authority

For around-the-clock GM news coverage

We'll send you one email per day with the latest GM news. It's totally free.