it depends on the kind of power your looking for? personally i wouldnt boost too high on an older turbo. and a t3 is still small if you want to make some decent power... If its for the bimmer, i think a t3 would be fine because you guys have some real serious compression and you really woudlnt run over 6-8psi to make decent power. if you want to be cheap for now and you can get ur complete kit together without a turbo and use that one till you decide to go bigger, go ahead. But make sure that turbo is good condition. i/e no shaft play, turbine spins freely etc. again, i wouldnt use an older turbo.