-The best grip car is the Porsche 911 Turbo with all stage 4 parts, with the front tires narrow for better handling in curves. This car will dominate in all grip races and can be used to defeat Ryo for the title without tuning. Use the best body kit and spoiler available and max them out.
-The best Grip cars are the Chevrolet Corvette Z06 or the Ford GT, both with all Stage 4 parts and the improvements needed to maximize the aerodynamics:
Tuning Leave the suspension or make it a bit more stiff. Cam timing - "Magic" seven clicks to the right (advance). Start/end boost - Max high/Max high. Nitrous Pressure/Flow Rate - About seven clicks to the right, depends on personal preference. Drivetrain - Make the first gear one click shorter than the second. Fourth, fifth and sixth gears should be one click more than the ones before them. Leave second and third gear as is. Leave Brakes