Red Silicone BOV Return Hose (MMHOSE-EVO-XBOVRD) by Mishimoto. Includes: Silicone Hose, 2 T-Bolt Clamps. Inner Hose Diameter: 1.30in. Outer Hose Diameter: 1.80in. Mishimoto introduces the silicone BOV return hose. Created from high grade silicone and heat resistant embedded fibers, this is a direct replacement for your car and is sure to outlast the stock rubber BOV return hose. Not only will it be more durable than original equipment, it will add a unique touch to your engine bay!