Welcome to the forum ..
I'm not sure I agree with the advice about a car being an investment though ...
When you make an investment you are doing so under the assumption that you will receive a return on the money that you put into the investment. A house appreciates in value over time; stocks/shares pay a dividend as well as appreciate in value.
But a car is not an investment as it depreciates over time ...
Still I wouldn't let that put you off buying a 370z if that's what you really want!