Any tips on how to get this apart?

It's a sun of a gun

Heat it with a torch and dump water on it. That will break the rust loose.

Heat the collector ends and tap lightly with a hammer while trying to wiggle them off while hot Let us know how you get it apart, that will help others on here later with the same problem BTW, you might want to coat the pipes with antiseize before reuising them to prevent that from happening again

Cool guys!!! ThNks I'll try both of those tomorrow. First break the rust loose them I'll heat it up nice and try and bang her off.. I'll let you know how it goes

Mouse milk

http://www.mousemilk.com/

try brake fluid. that stuff gets in the smallest of cracks and crevices and frees up stuck parts.

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Mouse milk

http://www.mousemilk.com/

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Come on now, we need to keep some of these avaition trick stuff secret AKA, Mouse milk works very well on rusted or corroded parts that are stuck together, especially when heated Chiefs Aircraft Supply and Aircraft Spruce both stock and sell that product Good stuff