Free FP and CR
Choose a Ridge State Grand Prix that you have not yet cleared. This works especially well with RSGP 12 or 13. Finish the next-to-last race with a points lead of at least 9. Since you will always earn at least one point per race, there is therefore no chance of finishing the GP lower than 1st. When the final race starts, do not finish. Wait for the time to run out (3 minutes after the lead car finishes). Proceed past the results and you will find that you are awarded the full amount of FP and CR for winning the GP. However, since you did not finish the final race, you are forced to either Retry or Quit. Choose to Retry as many times as you like; you will continue to earn the full amount every time you do not finish. This will enable you to quickly unlock all of the hidden races and purchase all of the parts...but you will still need to rely on your skills to actually finish the races!
Machine Point bonus
Get 100 Manufacturer Points from a company to get a 10% and 20% discount and a special machine specific to that manufacturer.
Machine Connector Plug-Ins
Earn 100 Manufacturer Points with the indicated company to unlock the corresponding plug- in.
Auto Rocket Start System: Zolgear
Collision Decreaser: All tire and suspension manufacturers
Down Force Control System: Bosconian
Nitrous Tank 100: All nitrous manufacturers
Over Limit Start System: All engine tune up manufacturers
Prize Money x2: All manufacturers
Race Data Analyzer: Galaxian
SS Booster: Arkbird
SS Canceler: All exterior parts manufacturers