Help! Installed my new APN header last weekend and I have two fairly large nuts left over after I was done. What could they possibly be too? The only nuts I remember taking off were the two that secure the intake and exaust to the block which I definetly got back on there, and the two that secure the header to the downpipe, which I replaced. What other nuts would I of had to take off to replace the header? I'm stumped!!