Duster sound systems

Personally, I prefer a sealed box, but you need to apply more power to get the same volume. You gain the ability to play lower frequencies. Enough to be noticeable to most people? You would if you were able to switch from one to the other, but you probably wouldn’t miss it otherwise. Also do you travel with your windows down, how noisy is your car, etc
For an older, noisy car, I would probably buy a premade, ported box, A five channel amp, and 6 inch component 2 ways in either door, or kick panel speakers upfront. Bi-amp the front speakers, and forget about rear speakers, the fold down backseat doesn’t leave a good location for rear speakers anyway.