I just did mine recently I have the non navi non dsp setup. If your sub amp doesnt have high level inputs (speaker wires directly into it not needeing rca plugs) then yes you will have to use a line output converter to connect the rca plugs..You need to tap into the rear left and rear right speakers. I used this post to find the wires http://www.bavariansoundwerks.com/pr...em_Non_DSP.pdf
my amp is the alpine mrp m850 it has hi-level and rca inputs.. I chose to use the high level..
look at page 5 of 12 of the pdf for your answer. this is the factory amp connector.
Blue w/Black Stripe (+) twisted with Brown w/Orange Stripe (-) -Yellow w/Black Stripe (+) twisted with Brown w/Orange Stripe (-)
also this post in the diy
http://www.xoutpost.com/articles/x5/...ctory-amp.html will tell you which wires are which
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E53 06 3.0i
wishlist
Comfort Seats
speckdock 2.5
Mods
Air suspension - wip
skid plate replica - in box
OEM sunroof deflector
OEM bluetooth streaming
navi,dsp,tv retrofit - wip
Low prof roof racks
2 directtv satelite tuners
Grom audio usb2
quarter and back window sunshades
2 10"subs- boxes opposite sides/Alp MRP-M850
rear heated seats retrofit
rear footwell lights retrofit
remote window roll up
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