Review on Metra 70-8901 Vehicle Harness for 93-94 Subaru Impreza: A Reliable Wiring Solution by David Angelboy

I got a good Pioneer radio for my 2005 Impreza WRX STI and bought this wiring harness to go with it. My lord, this thing simplifies installation. Do all the soldering on the beautiful table inside and just plug it into the car and you're done. The only thing I screwed up was the antenna power wire - I think it was blue. I figured it was just in case your car has one of those antennas that go in and out when you turn on the radio, so I didn't connect them at first. My radio reception was just terrible. After some research I found out that the antenna in the car is actually on the rear window and is a fed (amplifier) antenna and this wire needs to be connected to the "amplifier in" wire from the head unit. After that, the new HU had absolutely perfect reception.