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You don't need to run any speaker wires.
Use existing speaker wires.
With Technic's harness you will just need to unplug connector from the OEM amp and plug it to the harness.
The harness is designed for replacing all amp channels and you cannot really just replace 2 channel.
I did it on my E82 an it took me less than 30 minutes to put back OEM amp.
The trickiest part of replacing amp is setting hi an low pass filters and even setting woofer polarity.
It takes a lot of trials and errors without proper instruments.
I will likely replace Hi-Fi amp during holiday week and I will post my amp install on this forum.
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