The Injen SP series Speed Pro cold air intake system is for the 2003-2006 Nissan 350z driver craving mid-range power for their VQ35 engine. These Injen SP series intake systems feature Injen's patent-pending MR Technology process for optimal gains, and a safe air/fuel ratio. The Speed Pro series systems do not limit themselves to just cold air intake or Short Ram systems. The MR Technology process has its effects on both types. The Speed Pro series systems are the world's first bolt-on tuned intake systems designed specifically for your vehicle!