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I ran the H4 E-codes for several months before I got around to installing a relay harness. When I finally got the harness installed the difference was amazing (and I am using stock wattage bulbs).
Maybe it's not necessary to run a harness with stock wattage, but, when the bulbs are getting current directly from the battery, they are definately brighter.
I bought my harness from 944online.com and it took about an hour and a half to install.
Vern
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