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I used the videos BSW has on YouTube for the subwoofer installation, wiring colors, which to tap, etc for my E53...do they not have the same for the E70? I wouldn't pay BSW's prices, but maybe checking out their site will get you the info you need...wiring colors for left, right and remote turn-on being the most important ones that you need to find. The problem with taping the wrong wires on the amp is that some may be controlled by the DSP, but for the subwoofer, you only want the signal that isn't filtered so you can let your aftermarket amp do all the filtering.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's
135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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