I was looking into the Hardin Marine Seaward Small Block Exhaust System, they say they are rated up to 415HP. I'm looking to build a 406 sbc stroker, it should be in the neighborhood of 475HP...Anyone think I will have problems as far as exhaust flow restriction with these? I can't find anyone using them yet and I'm wondering if they are worth buying? The price isn't bad and they have a Stainless Marine look to them except with a square type flange riser. Looking for any info on these if anyone is using them or knows of someone who is.

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Wow, no one is using these? Am I going to be the guinea pig?

Its the first I've ever seen them. I'm using GLM manifolds.