i dont think the ls4 cars are muscle cars. the big block first and second gen rwd cars werent considered muscle cars, so im going to say the fwd small block car isnt. i always thought they were luxury sport coupes. then again i dont think that a 4 door charger, magnum, or g8 is either. i think it would take a different kind of person to consider a 4 door 70s nova/chevelle, vista cruiser, or any of the other 4 door, rwd intermediates with a big blocks in them a muscle car. i dont think you can base what a muscle car is purely on a drivetrain layout, and,hp figure. its more than that. sure its about hp, and, rear wheel drive, but a muscle car was more than that. it was a style an attitude that was uncompromising, and unforgiving. when i think of a muscle car i think of a mid sized, rwd, v8, coupe, that said **** you im faster whether it was parked at the curb or stalling up at a street light. it didnt give a **** about mileage, engine noise, or seating. it was built to beat someone, and thats it. times are different now. there are bad *** cars out now whether theyre fwd, 4 door, 4 cyl turbod, but the muscle car is no more.