Mishimoto Blue MMHOSE-SUB-IHBL Subaru WRX STI Silicone Induction Hose Direct fit for 20012007 Subaru WRX and 20042015 Subaru WRX STI INNER DIAMETER: 2.0" & 2.6" OUTER DIAMETER: 2.4" & 3.1" High grade silicone and heat-resistant embedded fibers feature max temp of 330F Mishimoto Lifetime Warranty