i can help you w/ the settings...make sure to save multiple settings(keep the original) on your memory card...the settings are a little hard to steer with, but they are good blow your friends away with on Test Course.
What to buy:
All Engine Upgrades
Racing Tires(whatever ones you like)
Lightweight Bodies(all 3)
Clutch/Triple Plate
Flywheel/Racing
Driveshaft/Carbon
Transmission/Full Racing
Suspension/ Full Customize
Settings:
Ride Height- 84mm(mine anyway)
Gear Ratio:
Auto Setting: Level 48
1st: 3.093
2nd: 1.499
3rd: 1.046
4th: 0.771
5th: 0.600
6th: 0.454
Final: 3.500
These are my settings...I just did them as I posted this(weirdly enough, I didn't do those settings, like I usually do), and it beat out my Toyota Supra RZ for my second fastest car(gee, guess what first place is), and my Viper goes 269.00