Sengming,

So far, the NSX-R and the Pitworks are the only two that have headlights and brakelights. Sigma Automotive sells some standard DigiQs that were modded with headlights, and if you
have electrical skills, you can try adding the LEDs to your DigiQ by yourself.

If you play with the Digi Propo Special controller, I think you will
find that you can get the car to reverse faster. Also, you can change the steering so that the car can take tighter turns. There's also some codes for playing on the carpet, and some for floors, and they really make a difference in the performance! On my racetrack which is on carpet, I use the code 0281, and on the vinyl floor I use 0321.

I saw your pictures of the Bit Char-G and the DigiQ, that's great!
I didn't realize that the cars could look so different