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Apples12
Do not go down the stock route, as the wiring from the head unit to the amp in the boot is not there.
You would need to strip a breaker to get all the wiring for the head unit and then from the amp to the speakers(this wiring is different to the base). It would be a hassle and good luck finding a breaker with hifi option. From what I can see they are either base or stolen M5's which will be HK and will have cable runs to the rear doors - base and hifi have no speakers in the rear doors or mounting points.
The best approach is either
1.via bimmertech with the separate subwoofer cables as ISturboint states
Or
2.via the technic pnp 4/6 harness which will be cheaper at say $215 for technic harness with rca's + postage to UK and import duties and £370 gbp for an jl audio 600v2 or Eton SDA 100.6 for £293.
You could perhaps pick up JL audio 2nd hand off ebay for c£150.
The key item is to match your technic harness to your amp - is it rca input or is it bare wire/connectors. Get in touch with Technic on this forum he is a fountain of knowledge.
Both the above options are plug and play and will involve no cutting of existing wiring. Either way you will need to strip out your boot (10 minutes) and run cables the same way as the reverse camera to the head unit. Simple really. You will also need to run separate cables to your subwoofers in both instances.
good luck
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