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 |  Jun 29 2010, 8:09 AM

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In a bid to stay competitive in the ever-constant muscle car horsepower wars, the 2011 Dodge Challenger SRT8 is set to get a big increase in power. We’ve already heard numerous rumors of a new 6.4-liter V8 replacing the current 6.1-liter unit, but now comes word that along with improved efficiency, the new engine will boast 480-hp and 460 ft-lbs of torque – increases of 55-hp and 40 ft-lbs respectively. The new engine is also touted to get ZF’s new 8-speed automatic transmission for improved performance and fuel economy.

As for the R/T models, they will retain the same engine and output levels, while the base SE will see significant improvements thanks to the use of a new Pentastar V6 engine, which just launched in the new 2011 Jeep Grand Cherokee. That new powerplant will  bump output by 40-hp and 20 ft-lbs for a total of 290-hp and 270 ft-lbs of torque. Fuel economy should also get a boost, up from 18/25-mpg (city/highway) to 20/26-mpg.

A host of other changes are also set to debut on the refreshed 2011 model Challenger.

[Source: AllPar]