PNWYukon
Full Access Member
I have used these products in the past:
https://catalog.pac-audio.com/catalog/audio-interfacing/aoem-gm24
works well, simple install and good integration.
Different unit if you have the Bose system.
@89Suburban it really depends on your factory connections. If it has RCA jacks then it would be easy, if not then you'd would have to splice into the rear channel outputs and wire in your subwoofer that way. Amps still come with speaker wire connections.
As for the components, if you have no brand preference, then something like what the OP is doing would be good. If you want real thump, then get a nice bandpass box with at least one 10" subwoofer, like a Kicker or JL Audio. A brand matching amp is nice too, but not necessary.
Matching the amplifier RMS power output with the speaker RMS is the key.