Upgraded: Porsche 911 GT3 RSR

STUTTGART, Germany — Porsche Motorsport has upgraded the GT3 RSR, the long-distance racecar based on the 911, with a larger engine and better aerodynamics for 2009.

Last year's Nürburgring winner enters the new year with a redesigned front end that incorporates louvered air outlets on the hood and a rear wing with a wider adjustment range. Porsche also fitted lighter brakes and wiring harness, and is offering an optional air-conditioning unit.

To cope with new restrictions on air intake, Porsche bumped the flat-6 engine from 3.8 to 4.0 liters. The new power plant delivers 444 horsepower and 317 pound-feet of torque and is fitted to a six-speed sequential gearbox.

Inside, the GT3 RSR gets a new multifunction display on the dashboard, as well as a programmable multifunction onboard supply system control device.

Porsche Motorsport said it already has built 20 GT3 RSRs in Weissach for delivery to private customers. Prices start at around $495,000.

Inside Line says: A top-flight long-distance racer gets even better for 2009. —