Just throwing this out here.....now could you take the V-spec 21 piston and sleeve and put it in the VG 21 when it's ready for a piston and sleeve and really give this engine a boost???? I've seen the piston & sleeve on ebay for cheap....I would think it would fit..????? I can only talk for the V-spec 21 for that is what I have...I don't know much about the VG 21 ....????