I might be picking up a BNR stage 1 turbo for my S5. He has the ported S4 turbine housing and manifold. The manifold should bolt on right? what about flow characteristics S5 vs. S4? I think i've heard that the S4 turbine housings can be ported better than the S5 so boost creep is of no issue. Would anyone suggest getting the S5 housing ported instead of the S4?

Thanks
Wing

 

It will bolt right on as long as you have the manifold for that year turbo.

So
if you get a S4 turbo you'll need it's exhaust manifold as well.

If I remember right you will keep your years oil drain pipe.