Thanks for your replies,
Does anyone know how much laggier the journal bearing version of the 5858 is? ($800~ price difference)
I'm thinking of either getting a steam pipe manifold made up, and going the 5858 or using the std manifold, welding an external gate to it and using the 'bolt on' ss2.
Car is street only, and cost is a factor so I think I'm leaning towards the latter option.
Will the std exhaust manifold flow enough for 300awkw? (336rwkw before 12% lost through front diff)