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Turbo 4 > v6. The naturally aspirated v6 is on the way out in my opinion. The 4s can make more torque earlier and are more flexible as far as packaging is concerned. The v6 just doesn't make as much sense anymore. A 2.5l DI turbo could easily make as much power as the current v6 with more torque and a flatter power curve while getting better fuel efficiency when out of boost. It would be very cool also if GM were to bring back the stage kits they offered on the cobalts.
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