Something that's been crossing my mind lately is buying one more sa-8 v2 d2 for a total of 3 and putting them in a 4th order box. Sealed side would be around .9cft and ported side close to 3.5cft tuned around 45-50hz.
This is just something I've thought about and an open discussion may just push me into that direction. I'm intending on having my Lanzar opti2000d running at 1.34ohms. This will be in my 97 ford expedition.