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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Not sure what size it is, but.... chemicals are going to be your best bet. Exhaust gases flow thru there, which are a bit corrosive.... so, the fittings are going to be rusted together quite nicely. Hit it with some chems, and then tap on it with a hammer.