The biggest problem I see is that if you do not upgrade your engine to blue in the early stages, you may struggle with these two previously mentioned hunter races. After Day 1, I kept watching the store for engine, turbo, and gearbox conversion kits to go on sale for 12,500 credits and bought them. Usually the game provides only one kit during the challenges so that gets you to green. So it's more important to farm credits than parts...that's why the replayable credit reward challenge in chapter 3 is so important...plus you can refresh the store for 1000 credits...still time to finish the challenge with the use of some gold of course! Just play the credit reward and use any refreshes you have for the challenge and then hit up the store...remember that the engine and turbo are the two most important parts!!!
