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Just got some kooks catless longtube headers just wondering how would it do in long drives about 6-8 hours would the long tubes red hot or would it he just fine

I have a 2020 Mustang gt and I purchased some used kooks headers catless just wondering what are good header bolts for installation they didn't not come with hardware and also do I need o2 extension I read on a post you don't need them and some say you do

Hey guy I have a 2020 Mustang gt full bolt ons just wondering what the best spark plugs are