Should I stick with my original plan or try something new? !

[Liftingheavy1]

Hey folks! I really need some extra help with a system that is about 95% done. I have already had built less than 24 hours ago a 4 cf box at 39 Hertz for a soundqubed hdc3 15D2. I came across an amazing offer today for a sundown X 15 d2 nib for $200. I know that the Sundown needs to be tuned around 32 Hertz to perform well. The soundqubed sub requires higher tuning which is why I had the box built for that sub, which I plan on purchasing on Friday. My amp is a 1500 RMS powerbass asa3000xd.1.The box is going in the trunk of my Hyundai Sonata on stock electrical. All I have done is 2 gauge wiring for power and ground and a 200 fuse. So back to my question of should I just keep this X 15 or should I go ahead and use or order the HDC 315? I do not want to put out the extra money for another box to be made. Thanks for any and all of your help I do appreciate it! Have a safe holiday too!