I could make one but it would probably only consist of changing the word ROCK to FUCK. As a general rule, assume that nobody will ever make a ROM hack that you want. In the 12 years that I've been coming to this forum, I've only seen 2 instances of someone actually fulfilling another person's ROM hack request and I think both of those were translation related.
I've also seen multiple instances of people offering to pay someone to do a particular hack. Even in those cases, even when there were hundreds of dollars offered for a particular translation, nobody ever completed the task.
The moral of the story is.... if you want to see a hack of a particular game, you have 2 options. Hacking it yourself or developing sufficiently advanced AI so as to allow you to program a robot that can hack it for you.
ROM hackers rarely complete their *own* ideas, let alone someone else's.
Additional Note: Rock 'n' Roll Racing doesn't appear on either
DataCrystal or
The Cutting Room Floor so it's likely that nobody has ever bothered to hack the game.
Also, it might help if you mentioned which version of the game you're referring to, seeing as how it was released on at least 3 systems.