what kind of car is Lightening Mcqueen from disney/pixars movie cars ?

He is apparently an amalgam of different vehicle elements:

Unlike the other characters, Lightning is no car in particular. He does, however, have characteristic of a variety of sports cars. His headlights are just stickers and he has many sponsor decals on his sides, both similarities to NASCAR cars. Pixar was shown a Corvette by GM, which influenced his design. His overall profile was inspired by the Ford GT40. His tail resembles that of a Dodge Viper, while the tail lenses and roof are consistent with a Ford Mustang. The full size tour car is based on a 3rd Generation Chevrolet Corvette. His custom two-tone paint and tires are from a 1st Generation Chevrolet Corvette. Overall, his appearance is a hybrid between a stock car and various other sports cars, but tilted slightly towards the stock car style. He can be considered an overall generic race car. Also, due to the resemblence of the twins Mia and Tia (when they painted themselves in his colors), he has somewhat of a Mazda-inspired design, since the girls are Miata's, the only Mazda car to resemble a Miata was the RX-7, particularly the Savannah model.

The 2nd link for the actual Cars movie has a great list of all the characters and corresponding cars.

It's no particular maker, just an amalgam of a lot of cars

actually, it is an original creation from pixar. it isn't really a specific car.

A racecar!!

benz