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Discussion Starter · #1 ·
When I go to order the wiring harness for my 06 SI, Crutchfield.com has a note that says:

You will need to route the supplied bypass harness from the radio to the amp's location.
A small amplifier must be added to retain the factory subwoofer.


**What does it mean when it says a small amplifier must be added to retain the factory sub???**

Does this mean the factory sub wont work with an aftermarket headunit??
 
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