what about trying a different box and adding more power to the existing sub?
PASMAG | PERFORMANCE AUTO AND SOUND - Audiomobile GTS 2110 SubwooferCurrent type of sub is really a sealed small box sub. And no more extra power/amps due to wiring restrictions and not wanting to add an extra amp. The amp was covered in the first post.
Then just buy the 15" JBL for $80 that will solve all your problems.Unsure what you're trying to point out except what I already read before I bought the sub. Only thing I find is this one line "Audiomobile has managed to develop a subwoofer than not only will work well in small enclosures, but by changing enclosure type, it can also be used to satisfy a wide variety of user preferences." which I have never heard of this sub going in anything but a sealed box due to why people buy this sub. I don't like the sound of bandpass (don't know how to make a decent one either) so that leaves me with ported... will have to do some math again but pretty sure ported didn't turn out so great or else I would have done it in my other car.
you said this:Still open to other ideas if anyone has any though.
I would also look for ways to get the currrent sound into the vehicle better. Open up the rear deck somehow, and lower the crossover slope to 12db...and raise the HP value. Switch the phase 180 degrees. Move the sub in the truck...not sure where its facing now, but most people agree it should be facing the opening of the trunk.Just a follow up... yes it can go in a ported box and get a bit louder. Not as loud as the JBL in a sealed box but hard to beat free since I have the supplies.