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I'm working on a 2013 Chrysler 300 w/ 5.7l hemi. I was able to take off stock exhaust manifolds & install headers semi o.k., but there's a bolt hole at the top rear of aluminum head, both sides that is plugged and doesn't allow 8 bolts per header. I've got exhaust noise. And before I round trip headers again, I need to know am I supposed to drill out & remove bolt hole plug, so there's an upper & lower bolt per exhaust cylinder hole?
 
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