0Originally Posted by SWYZ721
It doesn't, otherwise my 2.0 would lose to a 5.0 mustang (stock), which it doesn't. What I first said was that the Forester XT is a 2.5 litre, not the 2.0 liter that it was said to be. Second, because it was being compared to the WRX wagon (I think), I thought I'd point out why it runs 13.9 sec., .2 better than the wagon. It is because of the half litre of extra displacement, which produces a better torque curve. Given krystar's original statement (2.0 XT), one might wonder why the heavier, less aerodynamic car would win with the same engine. It not the same engine.
Beyond that, displacement makes a big difference in (straightline) performance, but does not fully determine performance. Example: My Z28 (5.7 litre) and WRX (2.0 litre) are equally fast, but give my Z28 a turbocharger and it would crush the WRX. But it will still never touch it in the turns, or in the rain.