rf p2s ported or sealed?

2 12" RF P2's

1 500.2 RF amp. 737 watts RMS @ 4 ohms.

What would be the best box to go to? Im not looking for all out SPL. If anything, more a 60/40 SQ/SPL miz, if ya know what I mean.

I have been playing around in Winisd and I can gte the ported box to handle more power and Its curve throughout the 30-80hz range is within 3.3Db. Will this give a good a flat enough curve? Or should it be flatter? Its a 4ft^3 tuned to 24hz w/ a 120hz lowpass filter.

How accurate is the Winisd when it comes to how these boxes behave?

Car Is an 87 Supra hatchback, So space is limited to about 4ft^3.