Mishimoto MMHOSE-E46-330IRD BMW E46 Silicone Intake Hose Kit, 2001-2006, Red Direct fit for the 20012006 BMW 330i (including the ZHP) INNER DIAMETER: 3"-3.6" OUTER DIAMETER: 3.5"-4" Maximum Temperature: 330F Constructed with high grade silicone and heat-resistant embedded fibers Mishimoto Lifetime Warranty