I would honestly pull an EJ20 from an 02-05 WRX and the wire harness and drop that in your car. Should be plenty of power.
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2005 Subaru Impreza WRX
Slowboy Racing, Perrin Performance, Cobb Tuning, Invidia, Subaru Tenica International, and eBay
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If you need a car stereo install, email me at
imsowrxy@gmail.com. I come to you for the install.