Mishimoto MMHOSE-SUBJ-INT4BL Subaru WRX STI (STI only) JDM Silicone Intercooler Hoses, 2004-2007, Blue Direct fit for 20042007 Subaru STI JDM INNER DIAMETER: Hose 1: 1.16" & 1.30" Hose 2: 1.80" & 1.90" Hose 3: 2.00" Hose 4: 2.80" OUTER DIAMETER: Hose 1: 1.56" & 1.70" Hose 2: 2.20" & 2.30" Hose 3: 2.40" Hose 4: 3.20" High grade silicone and heat-resistant embedded fibers feature max temp of 330F Mishimoto Lifetime Warranty