Ford recently released the details of its styling and mechanical tweaks to the Ford Mustang for the 2013 model year, in addition to disclosing the power output of the next engine that will move the Shelby GT500. Both models will debut this week at the Los Angeles Auto Show.

Building on the success of all-new V6 and V8 powerplants for the 2011 model, Ford will try to keep its primary competitor, the Chevrolet Camaro, in its rearview mirror by refreshing the Mustang’s bodywork with a new grille, LED taillamps, wheel designs, two new colors and other minor cosmetic updates.

Mechanically, the 2013 Ford Mustang GT will get a slight bump in horsepower to 420, and a manual shifting feature on automatic transmission cars called SelectShift, where drivers can manually select gears via a button on the shifter. On manual models, a new hill start assist feature will keep the car from rolling backward before the throttle is applied. Additionally, a GT Track Package will be optional on GT models with manual transmissions and will include a more track-oriented axle ratio and other performance upgrades.

According to Car and Driver, a new Track Apps feature for V6, GT and Boss 302 Mustang models displays performance data on a digital screen in the instrument panel.

For horsepower addicts, the biggest news is that the 2013 Ford Shelby GT500 will receive a new supercharged 5.8-liter V8 engine. “Six hundred and fifty horsepower,” Autoblog reports. “Six hundred pound-feet of torque. Over 200 miles per hour.”

Visually, the GT500 will also receive aerodynamic bits to enhance downforce at higher speeds, in addition to minor styling tweaks similar to its less powerful siblings.

Pricing for the 2013 Ford Mustang models has not yet been announced. The 2013 cars will go on sale in spring 2012.

Check out our full coverage of the 2011 Los Angeles Auto Show.

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