compact version of the Nissan Sentra. Its engine (also shared with the SE-R) was the same 2.5-liter QR25DE unit originally created for the Nissan Altima and Frontier pickups. Power output from the Spec V's QR25 is rated at at 6,000 rpm and of torque at 4,500 rpm. It is mated to a six-speed RS6F51H manual transmission and a helical limited slip differential; which served as the only transmission of choice for the Spec V. The car's handling was aided with more aggressive tuning of the car's suspension (in comparison to lower trim models) and the addition of low-profile 215/45-17-inch tires and 17x7inch wheels. A front strut tower brace, firmer springs, revised shock damping, firmer front polyurethane bushings, dual-tip muffler, and front stabilizer bars were all standard. A four-wheel anti-lock braking system (which was packaged with front-seat side-impact air bags) was also optional equipment on all 2002-2006 models. Specific to the 2004-2006 model years; potential buyers could also purchase a 4 piston Brembo brake caliper upgrade. This model also came with a standard race-inspired sporty interior, such as Nissan Skyline inspired seats and a thick leather-wrapped steering wheel. Other optional features at the time included a Rockford Fosgate 300-watt nine-speaker audio system (with an sub woofer in the trunk), six-disc auto-changer, and a power sunroof. Other equipment include sportier-looking headlights with black surrounding the silver reflectors, standard fog-lights, lower-body sill extensions and a rear spoiler. Initially, for 2002 and 2003, the SE-R & Spec V was given an aggressive front fascia (styled after the Skyline GT-R) with side still extensions and rear trunk-mounted spoiler. Originally, speculation arose surrounding the Spec V designation being a play on the GT-R V-Spec Skyline name. This speculation has been proven to be true with the introduction of the R35 GT-R Spec V in North America. It is speculated that use of the Spec V designation is due to the fact that Nissan cannot use the V-Spec title in the US market. 2.5 LE and 2.5 S The QR25DE was not exclusive to the SE-R versions of the B15 Sentra, this engine was also equipped in the 2003 Sentra 2.5 LE and 2004 Sentra 2.5 S. These versions did not sport any exterior resemblance to the SE-R/Spec V trims; they clone the exterior and interior of the lower trims (GXE, 1.8 S) to include clear headlamps, beige-colored interior cloth, and softer suspension than the SE-R's. The