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These were on my car when I bought it. I think they're around $300 new, so I can't see why anyone would buy them over a nice pair of coated headers. I don't know much about them, but they do look/fit real nice. Sanderson says that with the thick machined flange you don't need a gasket, only a little high temp sealer. This was not the case for me and I was constantly getting leaks so I started using a standard composition gasket and everythings cool now. I coated mine with a manifold dressing and they have stayed nice for 6 months now. They have like 1 1/2" primary tubes and a 2 1/2" collecter. I would like to see a comparo. between these, stock iron, and headers to see how these stack up. Thanks for any input.
I have read a review on those actually. Compared with stock iron manifolds and tubular headers, the Sanderson iron headers came about in the middle. A definite increase in power and torque over stock, but not quite as much as tubular headers.
These are exactly what you'd want to use for a twin turbo setup.