Has anyone had problems with O2 sensors is the 2006 3/4 Ton Hemi Trucks? Our truck is now four months old and has been in the shop every month for O2 sensors. The truck is eating them things like candy! We did put pipes on our truck! My brother-in-law has the exact same truck, same motor (Hemi) same people put the pipes on and he has had no problems. Has anyone else had any problems?