YES, they are a restriction. I port them though and make them able to flow as much if not more than the Fore Rails can. There’s a few restrictions in the stock fuel line right from the pump outlets to each individual injector feed port as well.
I did a long write up on the other Hellcat forum on this subject. I port your rails for $150 plus return shipping to you, PM me if you’re interested in getting it done, I’ve done probably 30 or so sets for Hellcat and RE guys. I just did a set yesterday.
I support 1100 wheel on E85 with ID1700 injectors on 2 295 pumps through the stock fuel line and rails with NO BAP. Search for “Stock fuel rails, why they don’t keep up” on the other hellcat forum and you’ll see what I do to them. Saves 4-500 verses going to fore rail plus you get to keep using your valve cover covers which if you switch to fore rails you can’t any more.
Here’s a link to it but some times the link does not take one to the tread, no idea why.
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