Worth the $$?
http://cgi.ebay.com/ebaymotors/ws/eB...category=33742

 

that looks like a s4 turbo with a knightsports sticker on it to me.

 

That's a compressor side upgrade for the stock turbo. they are about $750 brand new and assembled. It could get you up to the 350 hp mark or so.

 

well would it be compatible with my S5?

 

I don't see why not. It should use your existing exhaust housing, manifold, and exhaust wheel but replace the compressor side with a higher flowing unit. It would be a nice power upgrade as long as your aren't shooting for outrageous horsepower.