Yes mine’s a ‘19 with the B&O. I looked into a harness to make it simple and not have to cut wires, but could not easily locate anything. So I may just cut, soldier and heat shrink and be done with it.
I bought a 32oz bag which is probably way more than I need but will see of basic Polyfil. I’m just going to lightly stuff the enclosure and go from there. This is what I have done in the past in similar situations. I may adjust later on and tune it once it’s done and if things sound worthy enough to play with further. I know it’s going to hit harder with this much more highly upgraded woofer and this much more power. The Audio Control processor should not allow bass roll off either.
The only true thing I am yet to prove is will I be happy with a single 8” sub. For the price, simplicity of the upgrade and keeping a stock sized enclosure behind the seat. I am willing to compromise some.