Mishimoto MMHOSE-SUB-INT4BK Subaru WRX STI USDM Silicone Intercooler Hoses, 2004-2007, Black Direct fit for 20042007 Subaru STI USDM INNER DIAMETER: Hose 1: 1.16" & 1.30" Hose 2: 2.50" Hose 3: 1.80" & 1.90" OUTER DIAMETER: Hose 1: 1.56" & 1.70" Hose 2: 2.90" Hose 3: 2.20" & 2.30" High grade silicone and heat-resistant embedded fibers feature max temp of 330F Mishimoto Lifetime Warranty