Nitrous Outlet's Pro Wiring Harness And ProMax Nitrous The Pro Wiring Harness came to be as a way to provide nitrous users a means to cut down on the time it takes to wire a car correctly. For race teams or shops who install nitrous systems, the Pro Wiring Harness allows them to put only one tech on the job to install nearly any nitrous system with its straightforward design. Pro Wiring Harness - Nitrous Outlet The Nitrous Outlet Pro Wiring Harness was designed to eliminate the problems associated with nitrous installs. With the electronics and accessories available in today’s nitrous systems, wiring can quickly become an intimidating and extremely time consuming job. This harness is user friendly, and can be used by beginners and pros alike.