The SP series of cold air intakes is Injen's flagship system in their lines of traditional aluminum cold air intake systems. It provides our signature intake growl that will surely excite your senses as you open your Volkswagen GTI and let that turbo spool. The soul of this intake is found within our 3.500in air intake tubing that is manufactured from premium grade 6061-T6 aluminum. That massive intake tube provides a smooth uninterrupted path for highly efficient airflow and maximum power gains. Our engineers have painstakingly designed the intake to provide the highest levels of safe power, along with clean aesthetics that will impress every time you open your hood. In addition to the impressive power increase, the Injen team has ensured that a safe Air fuel (A/F) ratio has been maintained throughout the power band.