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Whats the difference between the 2.0 they put in the third gen vs the 2.0 in the 4th gen.
 

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2011 Kia Optima
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The turbo is smaller on the fourth gen, and here's a few differences:
camshafts
head
throttle body
crankshaft
pistons
intercooler
 

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2011 Kia Optima
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As the turbo is a different configuration and part of the manifold, the 4th gen is different as well as the pre cat, down-pipe, center muffler, and rear mufflers, but the oil inlet tube gasket is the same.
 
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