I'd say that the engine damage would have occured while racing in a car with very low milage. Hitting the rev limiter in neutral is no big deal at all since the car is'nt under load. Even under load you can bounce it off the limter every now and then, but that only applies to a motor that has been corectly broken in. Drag racing in a car with 4,000 miles is the first indication that you are a 16 yr old who is having a little to much fun. In a few years (if not sooner) you'll understand the importance of breaking in a car. How many times have you changed your oil?