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 |  Jan 23 2009, 5:01 PM

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Looking to continue its dominance in international motorsports, Porsche has released a new version of its GT3 RSR race car for the 2009 season.

Last year RSR’s took the top podium spot for their classes in both the 24 Hours of Le Mans and the Nürburgring 24 Hour Race. The cars are also a staple of the GT2 class in the American Le Mans Series (ALMS).

The biggest change for 2009 is the introduce of an even larger displacement boxer engine, with an increase from 3.8-liters to 4.0-liters. Due to a reduction in the size of the air intake (the two restrictor pipes measuring just 29.5mm each), horsepower is actually down 15 pones to 450hp at 7800 rpm. Torque stays constant, however, at 317 ft-lbs at 7250 rpm. Porsche does claim that this new engine delivers a better torque curve with more power available at lower rpm – as one would expect with a larger displacement engine.

The aerodynamics of the RSR have received several tweaks for ’09 including large air outlets on the hood that allow air brought in through the front bumper to flow over the car, providing not only increased downforce but also increased airflow to the new radiator setup. The radiator design was changed for ’09 as Porsche made the decision to offer the RSR with an optional air conditioning system.

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The rear of the car also  features revised aerodynamics and the rear wing now features more adjustability.

Weight has been kept to a minimum thanks to a lighter brake setup and lighter wiring harness, although weight has increased slightly to 2,745 lbs.

Porsche has already built 20 2009 GT3 RSRs, which are currently being delivered to teams (like Farnbacher-Loles and Flying Lizard Motorsports) around the world.

Official release and more photos after the jump:

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