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So I found this description online of one of their headers:
Corsa 1-7/8 Inch Long Tube Headers - C7 Corvette Stingray. Complete the Corsa Exhaust System on your C7 Corvette Stingray with a set of Off Road Headers. Manufactured with High Grade Stainless Steel, these Headers feature 1-7/8 Primaries and a Full 3" Race Style Merge Collectors. Designed and engineered to mate directly to Corsa's world famous Double Helixx X-Pipe (PN-14761) When it comes to Corvette Exhaust Systems, Corsa Quality is hard to beat. 16004
But the note right under it says:
Product Note: Designed to mate to Corsa X-Pipe only. Will not work with OEM or other Aftermarket X-Pipes
Which is super confusing. Since the Corsa X-Pipe was designed to work with the stock manifolds. Oh well, I guess a phone call to double check is warranted. But, if this is true, it looks like I'm getting their headers.
It’s really not confusing. They are being truthful - they designed the 16004 headers to fit up to their X pipe. Prior to that they designed their X pipe to mate up to the stock manifolds and cat pipes. They are telling the truth. They just don’t want to cut their sales of one of the last remaining X pipes available on the market by telling people on their website that the stock X pipe will work just fine. If you call them they’ll shoot your straight. At least they did for me.