The way this harness is set up is that it utilizes 2 relays; one relay to activate the high beam and one relay for the low beam. So they still function the same as the factory (ie low beams are off when the high beams are on). However I can install an additional relay in the harness to accomplish the 4-High feature. The HD harness' are 100% plug n' play. So you don't have to do any cutting of the factory wiring what-so-ever. If you're interested in a kit, PM for additional details. If you would like the 4-high kit pre-installed in the kit, it would be an additional $15. Thank you for your interest!