Ceedawg, I totally agree that the 12, 14, 16, 18, 22 cm^2 numbers scare dsm guys, but do NOT equate to MHI numbers. I think that info hits the nail on the head. I like the BEP housings for ease of installation and the fact that you end up paying less in the end. But of course for the sake of efficiency. I do want to run a twin scroll someday. I am keeping my 18cm^2 holset TS turbine housing. . . Well, maybe I'll look for a 14cm^2 housing
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That's why in the Turbo Education Thread sticky it is mentioned not to use one a/r figure for one brand/style turbine housing to forecast the results of another brand/style with the same number.
Great info!