From what I understand the SC-813 has an amp built into the head unit but the SC-900 doesn't. You have to add an amp that sits under the passenger seat (or somewhere else you designate it to sit). I have no first hand knowledge but have read this of others' posts here and over on swedespeed.com You might want to confirm this before jumping into the swap.
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1998 S70 T5 Emarald Green Metallic (125K), 2004 V70 2.5T Ruby Red (45K), Previous Owner of Black '94 850 Turbo Wagon (Sold at 140K and miss her). My cars have been running so well lately they've got me worried.
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