9004 HB1 Heavy Duty Headlight Wiring Harness with Relays Upgrade Autobahn Autoworx It also comes with a

It also comes with a built in 4 bar or 7 bar MAP sensor further reducing installation cost

Restores full functionality to your lighting circuit

OEM-equivalent construction - Maintains factory cooling capacity and pressure ratings without compromise

high surface area)

9004 HB1 Heavy Duty Headlight Wiring Harness with Relays Upgrade Autobahn Autoworx It also comes with aConnect your vehicles headlight bulbs to FULL BATTERY VOLTAGE for MAXIMUM BRIGHTNESS! At Aspire Auto Accessories, we manufacture and carry our own Heavy Duty Wiring Harnesses with Relays that fit a wide selection of bulbs commonly found in most vehicles. This relay and wiring harness upgrade is one of the most simple and effective ways to improve dim headlights and overall headlight performance by increasing both your low beam and high beam