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Jim said they were discontinuing the 550's because at anything over 21 psi, the turbos would eat themselves alive and buyers kept sending them in for rebuilds. Jim said this had something to do with the matching of the compressor and turbine sides. To me, it sounded more like a 'mismatch'. If all you plan on running is pump gas, have 555 cc injectors and limit yourself to 19-20 psi (at this boost level, a FMIC would be nice) you will probably be in great shape. B.
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