Interesting, I noticed the volume diffeence with the 270 but prefer it with the focals, it was way too bright/much with the OEM centre for me so the kicker has toned it down nicely. I did consider unplugging also as it does sound cluttered as someone else said but I think the 270 is subtle...
I recently removed the resonator type baffle in the stock airbox, not sure how much it helps but can't be a bad thing to clean it up inside and have nice clean flow, maybe one for you to test out with this device 👍