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Stage 3 and Stage 5 are names that Turbonetics uses for turbine wheels. The Stage 5 is a bigger wheel than the Stage 3. The Stage 3 is the same size as a T31 76-trim turbine wheel, the stage 5 is the same size as a T350 76-trim turbine wheel. The 10-bladed exhaust wheels are better than the old 11-bladed turbine wheels. I don't know if they even sell the 11-bladed ones nowdays. The exducer/inducer sizes on the stage 3 are 2.228"/2.559". The stage 5 is 2.437"/2.795". More possible power, more lag. We have done .48 A/R with the stage 5 on 1.8-2.0 motors. Similar power and slightly quicker spool than doing stage 3 with a .63 A/R. Stage 3 and .63 A/R is the most popular combo on DSMs and Hondas. If your going to run a larger than normal compressor wheel or want more lag or your trying to get every last bit of power out of a smaller comp wheel then you might want to try the stage 5 in a .63 A/R exhaust housing.
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