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I don't know what stereo your car has but here is what I would do-
Go somewhere like crutchfield.com and input your car to see what options you have to upgrade the sound system. Most likely, you will want a set of component speakers with 6.5" and a tweeter for the doors/kick panels if your car will accommodate. Do NOT get 6*9 for the trunk- Amp/Sub combos for the trunk is easy. If you want something really small that rocks pretty good- the JL8W7 with a 500watt JL Amp will give you quite a bit without pissing off the neighbors and takin up your whole trunk. Seriously though, forget the 6*9 idea. Yes you will need line converters to wire it up. A better way is to replace the entire head unit and start fresh. Another better way is to get the JL Clean sweep setup (this will preserve your factory head unit)...you can read more on line about that.
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2007 M Coupe w/NAV/Premium/Extended Leather, Clearbra, DICE, 4.10 BMW Motorsport Polished LSD, Active Autowerke Gen IV Headers, Supersprint Race Exhaust and X-Pipe, ESS Tuned DME, KWV3 Coilovers, Volk RE30, OEM Strut Tower Brace, Short Antenna, JL AMP, JL 10W7, Valentine V1.
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