We already know Subaru’s next-generation WRX and WRX STI models due in 2013 will be getting a unique platform, hence they’ll also be dropping the “Impreza” part of their titles, but now we have word that the cars will also be lighter and more powerful than the ones they replace.

Speaking with Car and Driver at this week’s 2011 Los Angeles Auto Show, Subaru officials confirmed that the next-generation WRX and WRX STI will stick with turbo power but adopt a smaller 2.0-liter engine. The officials also revealed that curb weights will come down.

Importantly, while weight is said to be going down, power should be going the opposite direction. The reason for this is the recent launch of Subaru’s latest “FB” four-cylinder boxer engine.

In naturally aspirated trim, this engine’s peak output stands at a relatively unexciting 146 horsepower and 145 pound-feet of torque. However, with a turbocharger attached, and most likely direct injection technology as well, peak output should easily exceed the respective 265 and 305 horsepower outputs of the current WRX and WRX STI models.

Stay tuned for more.

Subaru also used this week’s 2011 Los Angeles Auto Show to announce that it’s new compact crossover based on the Impreza will be called the 2013 Subaru XV Crosstrek when it goes on sale next year.

For our complete coverage of the L.A. event, click here.