I know very little about turbos,but have read alot about them concerning diesel trucks.Far as I can tell,the idea with them is a 2 stage turbo.One smaller one to help spool up quicker and then a larger one to carry it out with the upper rpms,when you need more airflow.I wouls think that a twin turbo would probably be better.2 small ones that spool up quick,bit together can move some serious air.Of course two cocts more than one.A guy at my track has a 302 fox body Mustang and he adapted a Ford 7.3L Powerstroke turbo to his.HE LITERALLY USES A COFFEE CAN FOR THE AIR BONNET :shock: .I looks crude buy he runs low 6s.And that truck turbo really screams.It is awesome.For the track,with a loose converter,I'd say one biggun.For the street,I'd say stay small.Just my $.02