High flow exhaust Manifolds?

Does anybody make high flow exhaust manifolds for a bodies? I have headers, but am getting tired of the clearance issues I am having with them. I've smacked high spots in the road twice now and one pipe is almost collapsed. I'd love to go back to manifolds, but not the crappy flow!
Any help is appreciated! Thanks!

You can’t have your cake and eat it too. Headers = high flow but clearance issues. Manifolds = less flow but no clearance issues.

Which do you prefer? High flow or no clearance issues?

It’s impossible to have manifolds without crappy flow (relative to headers) so don’t even state that.