Just bought a Pioneer AVH-P4000DVD. What would be my best bet for installing a small sub. I intend to keep the bose system and amp by using the Metra GMOS-04. But the headunit only has front and rear RCA outputs, I was thinking that I should split the signal for the front to feed the Metra interface. I'd then use the rear outputs for my Sub. Sound like a plan?

 

Yes. If your not running an amp on your midrange rear's just hook your sub amp to the rear rca's.
I'd get a bass **** for the amp tho, because without a sub output you can't control the bass on the subs without changing the bass in your mids.

 

Bass ****, never heard of that, but I'm just putting a sealed 8 under the back seat, no searious boom here, just solid bass to back up the factory system. Thanks for the input.

 

ahh. yea i wouldn't worry about a **** then. 8"s sound great in a truck.

 

Am I gonna need a dash instalation kit for the AVH-4000?

 

yes. if you dont have the HU already, buy from crutchfield - they will give you dash kit + adaptor for free.