ok, so my s4 turbo went out, I have a s5 turbo and manifold basically waiting for me for $350. it has around 50-60K miles and has been on a turbo timer most of it's life. or I can get an s4 JDM turbo with only 40K miles for $160.
I am wondering a couple things. first, what kind of power difference is there between the two? second, will the s5 push more boost the then the S4?, I want to run 10 or more. third, I'm tight on money right now and plan to do a turbo upgrade anyway in the future so which turbo would be a smarter (power for the money) way to go.

 

Just get the s4. One of the only advantages of a s5 turbo is the wastegate design. Not an issue really since you can port the s4.

 

i dunno, i helped my bro swap to a s5 and i noticed a ton of difference