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Heat, penetrating fluid of your choice, lots of foul language and of course... a BFH. Good luck...
For the last 20 years I've never separated the right-side downpipe from the crossover on my T3. They were stuck when I bought it. Now I have a reason to separate them. Soaking with PV Blaster and tugging isn't working. What's the secret?Moto
My advice is to heat it cherry red ................Brian
After disassembly and cleaning or installing new exhaust components, coat mating surfaces {sliding fits,flanges & gaskets} with Nickel Anti seize . Don't use copper antiseize, it can corrode stainless steel and doesn't have the high temp quality.
When using the method I described it is the rapid water cooling that does the work.Brian