So, I was reading about the differences between S4 and S5 engines... And, I got to thinking... Has anyone taken the S5 upper intake from a TII and milled it out to S4 lower intake width to maximize upper power and lower torque and then replaced the S4 turbo with the S5?

I'd really like to see what the best setup is for both worlds.

What's best to mix and match?

Please and thank you.

 

Just use the S5 TII keg.you can also use the s5 manifolds too,but you will need the electronics(sensors) of the s4 to make the Ecu think that the car is an S4.You can run the S5 turbo on it.

 

definitely use as much s5 parts as you can...