04-10 Duramax HSP Billet Valve Covers Color:Silk Satin Black OEM up-pipes eventually fail from

OEM up-pipes eventually fail from constant temperature and pressure fluctuation

This solves the common issues with the factory supplied plastic pipe and intercooler boot

Removes Air and Vapor from Diesel Fuel

SW # 4 : 90 Hp increase

04-10 Duramax HSP Billet Valve Covers Color:Silk Satin Black OEM up-pipes eventually fail fromOur billet valve covers are designed to give your engine a clean, sleek look. They feature a 1 2" NPT port in the center of the cover to optimize crank case ventilation. They are made from 6061 T6 Aluminum, and they incorporate an O Ring to eliminate the need for messy silicone. It is recommended to run these valve covers with our forward facing thermostat housing, for there are no provisions to mount the factory hardware to upper valve cover. Our