RE: 1996 a4 amplifier installation.
Yes, you'll have to go through the firewall (sorta). The way i ran mine was that i took off the pollen filter cover, removed the pollen filter, and ran the cable down through the cabin behind the glovebox. There's just enough room aroundthe climate control fan housing to squeeze your cable through.
To me, that was the easiest way to run it without actually having to drill through the firewall itself.
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MCMXCIX Casa 2.8qt
SpeedTuning Chip, Tip-Chip, Magnaflow Exhaust, Koni Coilovers, 18" BBS LM Reps, K&N 57i
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