I have an '05 with and '08 HU and all I had to do was plug and play. to run my ipod though I needed to get a specialty built cable off of ebay. seller was billc41 I believe.
2011 Subaru STi DD/Track Monster | Stage 2+ | Eibach ProKit+ | Cobb Tuning Downpipe | Cobb SF Intake | Ark Grip Cat-back Exhaust | Deatschwerks 65C | COBB APV3
Tanabe Revel VLS Oil Pressure/AFR Gauges | Seibon CF Hood | Moroso 2-Stage Catch-cans | Advan RZ 18x9 +45 | Hella SuperTones | Tint | White Satin Pearl
2003 Lexus IS300 Sport Design | 5-MT | Thundercloud Metallic
RIP Suprman133 4/26/88 - 9/20/11