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We have not yet validated our package in the F30, but we hope that in 45 days we will be offering a PnP package just like you describe. I would be shocked if they changed the amp harness, it's been the same for HiFi since the E46 at least.
The HiFi amp gets lower-voltage preamp, but for just adding an amp, you're best off using the woofer outputs from the amp, not messing with the preamp signals (too easy to introduce RPM whine that way).
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