Originally Posted by Boosted Performance

The combination of small T25 housings and poor design/flowing manifolds will limit maximum power. So you can put whatever turbo you want on there, you will always be limited to the turbine housings and manifold design.

If you compare any manifold to the F.I units, it is very obvious which manifold will flow more/better and produce much better results.

Remember this picture I took:

T25 .63 a/r turbine compared to a Precision T4 1.0 a/r (that is only a 1.0 a/r housing too, they go up to 1.32)








Whatever air the compressor pushes out, the turbine has to be able to handle as well.