Question on swapping series
 

Ok, I have a S4 T2. I ordered an engine from a local engine importer for a great price, but when it got here it was a POS. So I got my money back, the importer isnt bringing in any more 13bt's. And he has what seems to be a mint condition S5 there.

I was thinking about just using the block and a few of the better designed parts off the S5 on my S4. In the next 2 weeks i'll be doing emissions removal, TID mod, 3in turboback exhaust, E-fan, and battery relocation.

What would I need to keep off the S4? and what is better to use thats on the S5?

I was thinking using the block, Exhaust manifold, turbo, alternator from the S5. And everything else from the S4?

Any suggestions?

Thanks

EDIT: Ohh and BTW, the importer dosnt have the S5 ecu or wiring harness. So i'll need to run off my S4 ecu.

Kevin has a write up on all the "crazy" combinations:
www.rotaryresurrection.com
Look in tech section

Thanks Turbonut, i've read that. But I wanna know, with different compression ratios will the engine's run differently (poorly?)?