There's a slight knocking on my 3rd cyl, I'm pretty sure at least, I might just be hearing things. Any ideas as to what this could be or an easy fix? I would really like to do a 3.4 in the future but don't have much cash now.

Also one of the bolts for my egr snapped off in the header, there an easy fix for that or should I just use it as an excuse to buy new headers? I hate having things broken like this...