I installed an aftermarket and spliced two speakers into the rear channels. now i got six speakers. and most aftermarket decks have 1) a built in amp that is most likely more powerfull than stock 2) RCA preouts to add an amp on 3) cleaner signal. you could splice into the factory din plugs, but for just over a hundred bucks and maybe an hours worth of work you could have a much nicer sounding aftermarket. heck, even the factory speakers sound better with a new reciever!
good luck!
matt
oh, btw, i agree, the wiring diagram rocks! (in fact, any and all the green manuals are your best tool)
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--- '89 740 Turbo
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