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Message: [QUOTE="NRHX2009, post: 561993, member: 1216"] New Billet S366 11 blade and S475 7 blade and 11 blade drop in compressor wheels [B]S366 11 blade specs: [/B]18 grams lighter than cast version, 2.7mm smaller hub = 2.7mm more blade surface over cast version [ATTACH]13508._xfImport[/ATTACH] [ATTACH]13509._xfImport[/ATTACH] [B] S475 7 blade Specs:[/B] 19 grams lighter than cast version, 2mm smaller hub = 2mm more blade surface over cast version. 13 degree staggered secondary blades. [ATTACH]13506._xfImport[/ATTACH] [ATTACH]13507._xfImport[/ATTACH] [B]S475 11 blade specs: [/B] 30 grams ligher than cast version, 3mm smaller hub = 3mm more blade surface over cast version. 6 degree tapered blades [ATTACH]13511._xfImport[/ATTACH] I do not have dyno #'s but, [B]S366 11 blade[/B] customer picked up 4psi more boost with stage 2 injectors on a 7.3L and noticed a 75-100 rpm quicker spool. [B]S475 7 blade[/B] test with 300/200 injectors on a 7.3L showed 7 psi increase with about the same spool up time, with a stronger mid and top end pull. [B]S475 11 blade[/B] test with 300/200 injectors on a 7.3L showed a 5psi increase with 100 rpm quicker spool up time, with a stronger mid and top end pull Wheels are pre balanced but i do recommend a rotating assembly balance. I will do a free installation & re-balance with purchase of compressor wheel. Only thing you have to do is cover shipping for cartridge both ways. 1 day turnaround. Please pm, email or call for pricing. -- James [/QUOTE]