get someone to help out first. heat manifold up with your map gas setup. get a beeswax candle and touch it on stud threads,it will wick up threads then have someone with impact remove nut. if the stud breaks remove manifold and drill it out. this is what my exhaust guy tells me he is going to do and charge me a small fortune because he hates doing it. so bite the bullit and prep your manifolds before you go to the exhaust shop.it's a crappy job but necesary. when they are all fixed use tons of anti-seize when you put it back together. good luck
