Answers: the own heavy duty internal parts and lower compression pistons and possibly a different cam and computer profile
The 2.0 L is the non-turbo, as is the newest 2.5L engine.
The turbo ones are 1.8 (gas) and 1.9 (diesel).
If you want to turbo your 2.0, there's loads of info on the fourm below, but supercharging might supply you a higher benefit of power/cost. Either means of access, check out the vortex.
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