I would like to see
Firebirds
Firebird Formulas
Trans Ams
Corvette "Mako Shark 2" Prototype
Covette "Snake Skinner" Prototype
Ligenfelter Twin Turbo Corvette (Unsure on spelling of Ligenfelter)
Viper Venom 800
Monte Carlos (80s and before, when they had real power)
Novas
Chevelles
Malibus (from the musclecar days)
GNX
Any Italian Cars
Roadrunners
Cutlasses (muscle car days, like the 442 and the 455 rocket)
GTO Judge
any other old muscle cars that i forgot
old impalas
Bel Airs (might be spelled wrong)
the new lambos (diablo replacement, can't think of the name)
The return of the Vectors
And of course the return of the racing mod
The ability to put different motors in cars (like say instead of a 350 or so in the trans am be able to put something more like a 427 chevy or a 512 caddilac in it) as long as it would fit in the frame.
being able to choose what brand of tires, oil, brakes, brake pads, and air filters your car has.
and also be able to choose the caliper and the rotor size for your brakes
Aftermarket parts like Borla exhaust for the Vettes.
And if a car can have a special modification (like the ligenfelter twin turbo vette and the henessey venom 800 viper and the roushe mustangs) have the ability to have it done in the tune shop. Yes i know that last bit is confusing, but I couldn't think of any other way to word it.