To further optimize the intake efficiency, this car GT-R also installed US AEM cooling water / methanol injection system. It works by spraying cooling water into the intake system / methanol to achieve increased intake cooling effect of the air density per unit volume. Spray amount precisely calculated AEM control unit, do not worry about the discharge of cooling water / methanol engine damage. If you do not understand can think of, rainy days, the engine will inhale air containing some moisture without problems. Turbo compression system mk4 golf lowering springs as the density of the intake air rises, also the temperature will rise due to thermal expansion and contraction of the quality of the air, the air content per unit volume will decrease, so that the impact of the intake air amount per unit time of the engine in order to solve this problem, optimize intake efficiency, this car GT-R to install a Greddy intercooler. Power will increase engine temperature rises rapidly, by replacing KOYO cooling tank to solve the problem, two radiators are placed after the bars first. In order to be able to play the potential of the turbine, the need for intake and exhaust system upgrades to meet demand. HKS 270-degree camshaft mk4 lowering coil springs kit‎ and a few doors spring, with injen intake mushroom head and HKS intake pipe, can effectively improve the efficiency of the intake and exhaust system uses a high-performance titanium exhaust aSpec. After middle diffuser design with a circular mouth and diversion "fins" on both sides of the oval diversion port, using this design can help vehicle air quickly export the car, optimized underbody and low voltage. Original exhaust system from bilateral to unilateral four single out aSpec exhaust. aSpec exhaust system is titanium alloy material, the quality is much lighter than conventional stainless steel exhaust mk4 golf lowering coil spring, wall thinner design, but much shorter terms of product quality, quality is generally titanium exhaust system for three years 100,000 km, the quality stainless steel exhaust system is generally 5 years 150,000 km.