Just my $.02 on this one... "hiding" the 40k can be a bit trickier than it seems. First of all, if you're industrious enough to have saved 40K, you realize what a poor "investment" a car would be.
Buying a house is a much better investment, but will find ways of appearing on your 1040... home loan intrest deductions, improvement deductions etc etc. Even modestly invested savings will have earnings (perhaps not like the mid 90's... but some ) and that must also be claimed on your tax returns.
It then becomes an issue of how to "hide" the money... whether by transfer to another (trusted) party like your parents... (transfer has an entirely different set of somewhat complicated rules), or somehow investing it in such a way that the "benefits" of such a transfer don't affect anything that shows up on your FAFSA. Essentially, money laundering 101. Consider it an experiment in economics and social sciences
I don't have any suggestions, just a word to the wise that hiding that amount of money in an "investment" isn't as simple as it sounds. You want that money to work for you, which will show on your 1040, which will then show on your FAFSA.
Perhaps a joint meeting with your parents and their financial advisor would be the best path?
on the OTHER hand, I just wish i had your problem!!!