I think the Corvette illustrates how PD could do a lot in GT5 with resources it already possesses in GT4.
In terms of historic Corvettes GT4 has a 1954 Corvette convertible (C1), a 1963 Corvette "Stingray" coupe (C2) and Z06 (C2) race car, and a 1969 Corvette "Stingray" L46 350 (C3) 1969. As the game's "C" designations indicate, between 1953 and 1983 there were essentially only three Corvette models: 1953-1962 (C1), 1963-1967 (C2), and 1968-1982 (C3). Although GM stylists made sure that each model year had its own distinctive look, the basic mechanical underpinnings of the cars of each generation (e.g. C1, C2, & C3) remained basically unchanged and, most important, the dimensional "box" within which each model fit was unchanged. So, as far as PD is concerned the physical space taken up by a 1968 Corvette is essentially identical to that taken up by a 1982 Corvette. This means IMO that PD could render 15
very different-looking Corvette models between 1969 & 1982 (as opposed, say, to 15 very
similar-looking Skyline models) and from a physical point of view they would be virtually interchangeable.
Why would PD want to do this? Well, for one thing, the Corvette has a
huge fan following worldwide (but especially in the U.S.). For another the Corvette has a long and distinguished racing record internationally (not just the U.S.). Much more so than, say, the Slyline. Which makes it much more relevant for a game that ostensibly puts an emphasis on racing pedigree.
Practically from the moment that the Corvette received the legendary Chevrolet small-block V8 in 1955, the car started racking up racing victories and national championships. Between 1956, when Dr. Dick "The Flying Dentist" Thompson earned SCCA C Production honors, and 1971 Corvettes won 19 national SCCA championships.
In 1960, millionaire American sportsman Briggs Cunningham entered two new Corvettes (C1) at Le Mans, where they finished 8th and 10th.
For decades afterward the Corvette became a regular fixture at the 24 Hours of Le Mans and other international endurance races because of its ability to deliver Ferrari performance at Chevrolet prices.
As a prime example, this 1968 Corvette,
took 7th in class and 15th overall at the 1972 24-Hours of Le Mans race. Although the Dave Heinz-Bob Johnson team was a private effort, Chevrolet unofficially supported them and provided the team with an L-88 427 ci engine and M-22 "Rock Crusher" transmission. During practice the day before the race, the car ran over a banner and hit a wall. Working overnight, the damage was repaired and the car raced at Le Mans with "racers tape" and rivets holding the front end on. The success at Le Mans wasnt a fluke. The car also finished 3rd overall at the 1973 24-hours of Daytona, 6th overall at both the 1972 and 1973 Daytona races, and started on the pole at the 1973 12-hours of Sebring.
Take a look at any racing footage of the Le Mans race between 1968 and the late 1970's and one is likely to see one or more C2 competition-model Corvettes in the background vying for a class win.
Not only were competition Corvettes thrilling the crowds in Europe with their thundering big-block presence and taking all the championship gold in class at home, but the Corvette "specials" made for racing by GM and others would be right at home at the auto show (then and now).
Like the legendary Corvette Grand Sports, designed to take on the Cobras mano-a-mano:
Or the 1957 Corvette SS raced at Sebring:
Or the original 1959 "Stingray" designed and built by then vice president of General Motors Styling, William L. Mitchell, and campaigned as an independent on the sports car club circuit in 1959 and 1960.
I don't know about you but I'd much rather own and drive one of these cars than another indistinguishable edition of Japanese street car.