I have upgraded to 2012 A4 MT 2.0 TFSI last month from a 2012 VW GTI 2.0TSI. Before swapping the cars I thought they share the same engine, except that Audi has added the valve lifting for more torque.
Recently, I found out that none of the parts are interchangeable between these 2 engines (which I thought are same). I was kind of surprised to hear that... same manufacture, same horsepower, both use FSI system...
My question is, are they really that different, and if yes, how?
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