I made a spreadsheet of the more useful cars in the game. On the second page is an upgrade calculator and comparison tool you can use by selecting cars and upgrades from the dropdowns. Access it with the link below:

https://docs.google.com/spreadsheets/d/17AGPB3f7vS6KYm4bCUN5Lg_4iFf88dbWb1srS840BZ0/edit?usp=sharing