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this is my gfs car and im trying to throw some subs in the trunk and she wants to keep the factory headunit. i need to know if theres any outputs or adapter to keep the factory headunit and still hookup the sub amplifier... thanks

 
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It should be no problem, Honda sells there own factory sub that fits on the rear deck lid.

 
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I'm curious to know this, too. I have an 800w Pioneer sub and amp that I would like to use to replace the factory amp/sub. How would I go about doing this?

Bear in mind I haven't actually *paid* for the car yet; i'm still on the weekend test drive..but I knew I was going to buy it by the time I hit third gear for the first time.

 
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You just have to splice an RCA jack onto the rear speaker wires. From there you might need a device to boost the signal (I forget the name right now) but from there it's a typical amp setup. Left and right RCA's and the power and remote wires.