I have Hella H4 DOT lights with 80/100w bulbs. I upgraded the wire harness with the Rennbay one after using the setup for awhile. It does add a noticeable amount of light output. It does add some hassle too. I have had to replace the relays on the harness a few times now due to exposure to water. If you make you own, maybe find a better spot to store them then in front of the coolant tank...
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-Randy
1984 944 -Race car project
1993 968 coupe- Amazon Green
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