Well I've finally decided to stop being lazy and put my BL in my truck but I ran into a problem while figuring out the port length. I have a 12" BL and I want to put it in a 2.5^2 ft. box tuned to 32 Hz. To do this with 2 4" aero ports they are gonna have to be about 24" I would just do slotted but since the box has to be slanted down on the top and up on the bottom I'm not sure how that would work. So I'm wondering if i could just use one 4" aero or if there are any other thing I can do to make this work. Thanks

IIRC You can get 6" aeroports special order from Parts Express. IMO 1-4" is too small.

I agree, one 4" would be way too small. A single 6 has more area than 2 4's, not by much but it would definitely be a better solution.

I could do that but then i would be longer than just going with 2 4s

Use PVC pipe to make the length.

well that sounds like not a bad idea thanks for the help