Does the Stock P11gt Stereo or CD Changer have a Pre-out/Sub-out.....to conect to amp....or how can I do this with stock Stereo/CD Changer......any ideaz R welcome....:confused: :confused:

At some audio stores they sell adapters that turn your speaker wire into rca or sub outputs. Hope this helps!

what Kevin said above is true, but i find that the quality is not the same. Just get a new headunit.

The factory head unit DOES NOT include a pre-out.

Some amps do include a high-level (speaker level) inputs, which would probably be OK for wiring up a sub, but the quality will be lower than using a genuine pre-out.

Just get a decent aftermarket head unit - that in itself will probably give you a much bigger improvement in sound quality than running an amp off the factory head unit.