McLaren’s 675LT “Longtail” premiered at the Geneva Motor Show earlier this year. With a focus on lightweight, slick aerodynamics, and increased power all to sharpen on-track performance, the McLaren 650S was transformed into the 675LT, a car collectors and driving enthusiasts threw money at. You can read the background here. The run of 500 Longtails quickly sold out. After more than four years of evolution and hard work on the fundamentals of their car, McLaren hit commercial pay dirt.
McLaren Automotive now takes a second bite at the apple with the 675LT Spider, which has the same highly evolved McLaren corporate 3.8-liter V8, and most of the same aerodynamic and suspension trickery. The Longtail name comes from the movable rear airbrake, which has about 50 percent more surface area than on the 650S.
Thanks to the top mechanism and requisite additional bodywork, the Spider weighs about 89 pounds more than the coupe. In a car with 666 horsepower and 516 lbs. ft. of torque, another 89 pounds is an irrelevancy for most buyers, the difference in power-to-weight ratio measured in ounces. Unless you’re Fernando Alonso or a veteran Le Mans competitor, you’re not going to notice. In short, the better driver in the 675LT Spider will leave behind the lesser driver in the 675LT coupe.
Original Source: http://www.forbes.com/sites/markewing/2015/12/05/mclaren-675lt-spider-mclaren-finds-success-with-track-days-cars/