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depends on the T28 most are T-3 compressor wheels carved to fit in the stock .48 a/r T25 compressor housings. It effectively eliminating the diffuser section of the compressor housing. A little less than half of compression takes place there. all and all a t/3 t/4 combo is over 80% effective when utilized correctly. So you guys know where I stand T/3 T/4 combo all the way.
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