Hello! I am searching for information on how to replace my s4 turbocharger with a s5 turbocharger. I understand that the s5 will bolt right on, but my questions are about removing the twin-scroll system. Is there a thread on this anywhere?
I searched, And thanx in advance!

 

The S5 turbo will not bolt directly on! The S4 footprint is a different shape. You will have to use the S5 manifold with it. I don't believe the S5 had twin scroll. Also to consider, the wastegate was controlled by a solenoid from the factory on the S5, but if you run a line direct to the wastegate actuator, it will open at the same psi as the s4 (6-7 psi). Oil and water lines are supposed to bolt right up.

Hope this helps,
Vince