To remove the housing...
Insert flat screwdriver into the hole to the left of the plastic lens.....push to the right & pull the housing down.
Then just pull off the plugs.
this picture is taken from RikuE90 DIY instruction..... ignore the red and blue wire.
basically, the place that i circle in red need to be complete removed.
by using the diagonal plier carefully cut away as much as you can.
after you remove as much as you can, use the drill with grinder, carefully sand away any part of the plastic that still sticks out.
here is the finish product...
THE CRITICAL PART IS THAT YOU NEED TO TAKE TIME AND SAND AWAY ANY PLASTIC PART THAT STILL STICK OUT AFTER YOU CUT WITH PLIER.
THE LUXER 1 - 12 LED IS A PERFECT SIZE, NO EXTRA TO WIGGLE... IF YOU STILL HAVE EXTRA PLASTIC THAT STILL STICKS OUT THE LUXER 1 WILL NOT FIT IN PERFECTLY.
13 Audi S4...