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How well does the 66 71 that all the aftermarket sellers work on 12 valves. Is that a good large single turbo before going to twins. My reason for asking why is i work at a mack dealer and found found a borg warner s300 that measures that size. The turbine housing is bad and way too large. I found a company that does all turbo stuff and he has a 12cm housing. Is that housing too small? I believe that is the stock size on the hx35. Thanks for the information.