I believe the manifolds have 2 versions...the newer ones use thicker steel, although I'd still brace it for sure. Have you run into boost creep with the Spark mani? I havent heard of any issues with creep....the wastegate flange completely falling off, yes, but creep no :P

The thing that bugs me about the Spark kits is that its so hyped directly from the salespeople moreso than from the public. I dont see too many non-biased non-affiliated people with these kits putting up good numbers.

I too would rank the Spark kit below the Drag/RH, but I have seen promising #'s from them recently (probably due to that nice peak flow from the ITS turbo).