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Discussion Starter · #1 ·
There are a bunch of posts about adding a sub or doing the RF upgrade but none of them have the wiring color codes or any real useful instructions for doing it. I can't seem to find the wiring harness for the RF upgrade available by itself (which would be super since the Flex41 is like $50 on eBay) and I am not paying $350 for the upgrade. So has anyone figured out which wires behind the radio are for the front speakers? I assume that is what the Flex41 is using too.

I've been dying to get some bass back in my commute (1hr each way) but I can't figure out which wires to tap and it seems like no one has actually installed an aftermarket sub amp yet.

Thanks in advance.
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