I can tell you this his 3021 drives just like a stocker until you get on it , spools the TE60 precision housing better than my 9x11 billet. Driveability just as good as 9x11 with better spool it is a 10 in convertor. All the PTC 10 inches I used have not driven like stockers you can tell theres a stall in there. All 3 convertors rated 2800-3000 stall at zero boost. IMO Dave's wins hands down.