Take a 300ZX turbo out on a hot summer day and drive around for a while to let it get good and hot. Then punch it. Compare that performance to the same car out on a cool night? This is the comparison that customers have made on the before and after installing our intercoolers upgrade. Intercoolers cool the fuel/air mixture allowing a denser charge to be inhaled into the cylinders with each intake cycle. STILLEN VG30 intercoolers offer increased surface area - 35% over stock, the largest available for the Z.