i have a 2004 auto that has never been to the dealer other than an oil change. reliabilty is a major concern for me,but i would like a little extra for that power stroke or rice burner at the red light. should i leave it stock or add a smarty. i have gauges intake and exhaust so i am ready for the smarty just a little bit scared. i value your inputs because you guys have done this. let me know if i should mess with a great reliable truck. thanks for all your help