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I mean did you use the OEM gaskets as well as the PPE gaskets when you installed the headers?
Yes I used both gaskets... no leaks yet! I usually get a spray bottle and mix it with some soap and water then spray where the headers and exhaust meat... No bubbles yet so I think im good! I Will check again in about a month or so...
Just wait in few weeks your F will sound even better after header have gone through it's heating and cooling cycles, tone of exhaust note will change slightly.