Injen Cold Air Intake 06-07 Honda S2000 - P/N: RD1306 Product Model: INJ-RD1306 SP Intake Systems These Intake Systems Feature the Patent Pending MR Technology Process for Optimal Gains and a Safe A/F Ratio. The SP series does not limit itself to just a Cold Air System or Short Ram System. The MR Technology process has its effects on both types. SP is The World's First Tuned Intake System. For Honda S2000 2000-2003 2.0L and S2000 2004-2005 2.2L