I had the headers installed almost a year ago and just last week my car started to run crappy. I realized that one of the header bolts has backed out causing an exhaust leak. I also found that 2 other bolts which i could actually get a wrench on were also loose so thats 3 out of 16 that i know of. I wouldn't be suprised if all the others were coming out. I did get a set of cams installed about a month ago so i wonder if the vibration from the lumpy idle has coused them to back out. How do i keep the bolts in the head? I thought about Stage 8 locking bolts but there are mixed opinions on them.