ok.... answers:

Why 4WD? Because there is more power going to the front. On a real car, all the wheight is in the front cuz the engine so it keeps the front weight down and in the lead of the rear tires... with 2WD cars the motor is in the back so it is harder to get the front of the car into the drift angle and such, you'll just doughnut...

I Though Drifting was no Traction? It is, it's just the fact of being able to have some traction to control your car, otherwise it's like a plane in the air where you are screwing witht he Yaw effect... more steering, less power, oppisite will make you go another way, w/e

Tape and PVC? People use a number of things on their tires as opposed to foam tires or rubber compound tires. The lasts through about 2-3 runs before you have to change it out, the PVC and ABS piping go directly on the rims like a tire. PVC is white and has more traction... ABS is black like a tire and is the best you can get... like $7.00 for 10 feet of it! It's well worth it....

Hope this helps!