Podder , overall, there are no substantial proofs of 4GB nano-clone players existing yet. The highest capacity the player processors support is currently at 2GB.
So likely your player might be hacked too. You can remove the hack when you receive it with the guide
http://www.mympxplayer.org/how-to-re...ck-vt2400.html
Basically, if it arrives hacked, you can file a dispute via ebay/paypal, and demand for a full refund.
You can use an FM transmitter for your car. However, do note that some transmitters have fixed frequencies, whilst others have variable frequencies (which are better and usually more expensive).
I guess you can check out the prices on ebay and the stores and compare which gives a better deal.