04-10 Duramax HSP Billet Valve Covers Color:Silk Satin Black SW # 4 : 90

SW # 4 : 90 Hp increase

Downpipe used with install of S400 turbos with full Marmon 4

The gear case alignment dowel pin nicknamed the "Killer Dowel Pin" or "KDP" has a tendency to vibrate loose or walk out of its bore

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

and hose clamps are included to route the OEM or S&B intake to the HSM turbocharger

04-10 Duramax HSP Billet Valve Covers Color:Silk Satin Black SW # 4 : 90Our 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