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IIRC the VF36 is a Spec C Twinscroll with P25 housing and titanium shaft/blades. The VF37 is the same cover but plain bearing and no titanium. VF42 is S204 twinscroll with all the bells and whistles and VF22 sized. There is another VF but that’s for the Legacy and is Td04 sized but 2400 rpm spool.