High quality mandrel bent aluminum exhaust tube will survive meltdowns & backfires. Includes billet exhaust outlet with laser etched graphics that is anodized to prevent corrosion. High temperature silicone couplers included along with detailed installation instructions. 2011 Ultra 300: Replaces soft rubber exhaust hose with sturdy aluminum tubing. For maximum performance use with RIVA Pro-Series Water Box (part# RK16091-1). 2010~08 Ultra 260/250: Replaces restrictive 1 3/4 rubber exhaust hose with large 2 1/4 aluminum tubing & outlet. For maximum performance use with RIVA Pro-Series Water Box (part# RK16091). Can also be utilized with OEM water box using silicone reduction coupler (part# RK16090-08-ERC).