2006 Mazda Mazdaspeed Mazda6 Sport 4dr Sport Sedan AWD (2.3L 4cyl Turbo 6M)
You will not believe for a second this a 4cyl until you raise the hood. This car smokes any 6 and most cyl on takeoff, top end and certainly cornering. No cons that I can see except the clutch is hard to get used to, it releases about 1" from the floor.
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