Tomioka Racing silicone inlet hose is designed to increase air flow to the boxer engine. Constructed from quality 5-ply silicone material, the inlet hose is guaranteed not to collapse. The inlet hose features 3 inch (76 mm) diameter for improved airflow compared to factory inlet hose and smoothly tappers to match the throttle body. Tomioka Racing silicone inlet hose is backed with our industry leading lifetime warranty. Tomioka Racing hoses comes in blue, black or red color to suit your needs.