It's not too difficult to make a replica such as this. Personally i think its just any other RX 8 which has been made to look like the original movie car and now its being marketed for such an insane amount just due to its claim to fame.
There should be substantial evidence to prove that this really was used in the movie. Other than that just pick up any RX 8 in between 14-18 lacs and splurge another 5-6 on it. In 25 lacs me thinks a better car can be born. But then again im no authority, its just my opinion which does make sense.