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determines the family of compressor. We will not get the power out of these that the 4.3L GM engine gets, they flow WAY more at a much lower pressure ratio. For our engine to make big power (600+ rwhp) we need to puch it over 20 psi, more like 24 or more, so we really need a compressor that is efficient at these high pressure levels, not all are. If I could get ahold of a 17c map (or a 19c) I could make a good guess, but I still recommend a full TDO6-20G with a 6-7 cm housing. Good spool, yet still easily does 650+ rwhp. The 8cm housing will get closer to 700 rwhp.
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