9004 HB1 Heavy Duty Headlight Wiring Harness with Relays Upgrade Autobahn Autoworx What size tubing do I

What size tubing do I need these for

Grab new header gaskets and studs before you start—it takes five minutes to do it right the first time and prevents leaks down the road

Yes—these mount directly at the OEM holes

Engineered to outperform standard automotive products

9004 HB1 Heavy Duty Headlight Wiring Harness with Relays Upgrade Autobahn Autoworx What size tubing do IConnect 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