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When removing exhaust flange nuts, a good soaking with PB B'laster orPreLube 6 rust penetrant works extremely well at loosening frozenfasteners. An overnight soaking of penetrant works best, then anair-impact wrench set on low can save considerable time and aggravation.The air-impact wrench utilizes an internal hammer to slug the nutsloose. Keep in mind that if you use the impact wrench on high torque, itmay break the exhaust studs like stick candy. If the air-impact wrenchwill not remove the nuts or if you do not have an impact wrenchavailable (air or electric), a propane torch will apply enough heat tohelp nut removal. Apply heat directly to the nut, avoiding the stud asmuch as possible. Keep a 9/16-inch socket, extension, and ratchet handyto loosen the nuts immediately. Watch the fuel hoses and lines whenapplying heat, and remember where you put the hot nuts after removal.