Couple of thoughts...

Perhaps a used pipe from a forum member or a junkyard would allow you to thoroughly clean it before install and study/plan on removal and install.

IIRC the connection at the bottom of the intake has a fitting between the pipe and the intake. It may be doable to remove that fitting to gain access to the inside of the pipe to clean it internally without completely removing the pipe.

Start soaking both ends of the pipe at the fittings with penetrating oil (not WD-40). Do it multiple times.

Good luck!!!

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