[wanab5150]

After I did the header bolts I went over the engine and chassis in search of loose bolts and nuts. I have tightened the header to muffler flange bolts numerous times assuming they kept coming loose.

I replaced the grade 2 bolts (which were used by the installer) with grade 8 bolts after removing them and finding they were stretched and bent from the constant tightening over the last 3 years.

There's a lot of vibration and movement at that connection so we'll see if the higher grade hardware will do the trick. I was luck they never blew the gaskets out.