No answers for you?
wow.
I didn’t want to comment ‘cause I’m not up-to-date on these things.
I put a set of CYCLONE headers on my ‘75 in 1983.
A buddy won them at a Corvette Convention Weekend raffle.
I bought them off him immediately that night for $50.!!
They have been removed and repainted(VHT) a few times since then and still working fine.
120,000 miles..! Honest!
They are nothing special, not coated, porcelyn, wrapped or anything special.

good luck.
graham
 
I’ve been running Hedman longtube since early 2000’s. First with Dart IE heads and Torker intake on a built for 1/4’s 383, last 6 yrs on ZZ383. Matches up to the vortex heads just fine. Then out through Ultraflows.
 
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Aug 12/2020 - I know this post is a couple months old, but I DID see a post on FB Marketplace - a complete exhaust system for a C3.
Did a screen cap n crop... fbexh.jpg
 
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