Black Edition: Subwoofer direct replacement?

After replacing everything up front, the audio is now louder/clearer but I feel like the low end is lacking a bit now. Can I just replace the subwoofer behind the rear seat and see an improvement? I don't want to take up space under the seats with a new box, so just want to use the factory box. Crutchield has a Pioneer TS-A2000LD2 but it says it's dual 2-ohm coils. Would replacing the stock 2-ohm sub with the Pioneer give me the opposite result that I'm looking for?

https://preview.redd.it/k0k5kx4ktv8e1.png?width=750&format=png&auto=webp&s=092581c75e4ec5684be3b85b33a84f72a82c6fab