ive searched the threads about exhuast back pressure causing heads lifting or what exactly causes your heads to lift with tunes? is it the exhaust back pressure or the cylinder pressure?? heat of exhaust or boost? lol or all the above? my reason for asking is that i am getting the looney toon from vivian and she has stated as long as im not pulling anything it will work with stock head bolts. i know anything is possible when running tunes on these trucks but what exactly should i monitor and watch for so i dont cause damage? i have all the guages and a scan guage im my truck.