I have just fitted a cossie t3 turbo to my zetec turbo and after about 2 mins of ticking over i start to get a little blue smoke ,Then if i rev it ,alot more blue smoke comes out, Am i right in thinking this is the turbo.

I have my old erst t3 laying about but i wanna stick with the cossie exhaust housing does the erst t3 fit in the cossie housing , also if it does fit is there any difference in the turbo's or is it just the housings.