So I was reading this one. Did the infiniti dealer really install kit without a tune? Lol! You bet they would warranty this as that was first mistake. Kit has differnt injectors and is blowing way more air into cylinders than stock tune ever anticipated. Stillen has documented requirements that you must use their tune for warranty to apply. A bad mechanic can happen in Infiniti dealer just as any other place.
I have a Stillen with warranty tune and haven't had any issues yet couple months down the road.