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