Upgrading soon. Loudest for the money with these conditions?

[Jakerrr 10+ year member]

Current system in sig. I'm not sure when I'll be upgrading, but I definitely will be eventually. I'm looking to get a DC 280 amp alt, a 4kw+ Brazilian amp, and I have no idea what batt(s) to buy or how many. My budget (EXCLUDING amp, batt(s), and alt), is very flexible, but preferably under $400. I definitely want very extreme loud body hurting bass, so this can go up $200 or so if need be. This will be a budget conscious setup, for what it is.

Now, 4kw+ should be pretty easy to get loud off, but first of all, I have a trunk car (but I'm taking out deck speakers, won't have to fold seats down to get loud), and my current box takes up the entire space I have available. It is double .75" birch. 3.5 cubes, 13.5H X 30W X 26D. Not even one inch bigger will fit for height and width, but I can maybe add an inch of depth at the most. It is braced enough to handle a powerful sub.

I want it to be musical, loud on all bass frequencies (25-65ish?) and have the ability to still slam on the lows, 24-32hz range. What would be the best way to go in this situation? Best bang for the buck gear is a priority here.

I have considered:

*Directly swapping out my sa-15 for a soundqubed hdc4 15, but I've heard they need 3.75 cubes, and it wouldn't give me any cone area advantage over what I currently have. Also, I feel like I'm getting screwed when the hdc4 18 is only $10 more but it can't fit in my trunk, lol

*some other single 15 that's cheaper and better than the hdc4, if one exists, maybe Incriminator Audio? A single sub would help keep cost down and quality high with my budget

*subs that do well in small enclosure

*2 really nice 10's?

*Lots of small cheaper subs like 6 8's. SA-8's or hds208's etc. These would have a lot of cone area and can work in 3.5 cubes

Can any "in-the-know" people help me decide what to buy?

Thanks

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[Jakerrr 10+ year member]

bumpttt

 

[Massive spl]

I would do a sundown zv3 15... They like small boxes and will love a 4k amp...

 

[Jakerrr 10+ year member]

I would do a sundown zv3 15... They like small boxes and will love a 4k amp...

Dang only 3.0 ft^3 recommended box volume. Thanks for pointing that out for me man I'll definitely have to consider that! Cut out is the same as the SA-15 too I could just do a direct swap. With the added motor displacement it would get about 3.45 cubes would that be too much space for it especially if I give it 4000 watts? I could 2 12's of those too. 3 10's would fit fine too but that's getting way too expensive. How would 3 SA-10's or 1 HDC4 15 compare to it? I like the hdc4 especially for the price but I'm worried 3.4 ish cubes wouldn't be enough for it, maybe if I give it a little more power like 5kw that'd be optimal volume?