it has an opening slit along one side to allow the wire to enter, but I found it easier to put the wire in first as it's a tight squeeze. Adhered along wall/ceiling and wall/wall edges. Caulked the gaps, and painted everything. Looks pretty much invisible unless you know what it is.

Can take some pics if you'd like.

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2002 A4 1.8T 5M. 128k miles and counting

teh mod list: BW KKK K04-015, GIAC K04-FX s/w, Genesis 380cc injectors, Fast Intentions 300-cell metallic HFC, Milltek exhaust, Racetec FMIC, S4 e-codes, USP front lip retrofit w/custom RS-type mesh, Zender trunk lip, Koni FSDs + Eibach pro-kit, Neuspeed 21mm rear sway bar, Moven SP-10 wheels w/custom finish and caps, B6 S4 black/nogaro alcantara front seats, nogaro alcantara shift boot with Euro knob, AMS shortshifter, RS4 pedals, RNS-E dvd nav, IDQ 10" sub w/JBL BP-300 amp, B5 S4 front calipers, DBA 4000 slotted rotors

AIM/Gamertag: denimA4turbo