Weirdly enough I think a few of us keep tabs on these topics. Kenwood sub looks nice. Wonder how the basket compares to the pioneer I put in as had to bend a bit of metal to make it fit as 8" doesn't always equal 8". Since installing, I've put in a removable 12" type s for those solo long commutes when I want a bit of punch.
I know the last comment was a year ago - on a thread from 2017 - but this thread comes up in Google when searching shallow 8" subs, so I figured I'd add this info.
Another option seems to be Kenwood KFC-XW800F: https://www.hotwirenz.co.nz/8-shallow-subwoofer-600w-peak/
In that link it is/was $160, although some other NZ sites have it at $200-$250.
My bh5 legacy had hesitation when accelerating then got worst and would rev up to 3k then die so replaced the maf and it runs and drive fine now but has a rough idle have check vac lines, has new o2 sensor has pretty new plugs anyone have any suggestions