External. And 10-12" is the length. Use 6's or 4's for the diameter. They come in a kit that has a pipe that you can cut to length. Or you can just use the flares on PVC.external or internal ports? where can i find 10-12" aeros?
External. And 10-12" is the length. Use 6's or 4's for the diameter. They come in a kit that has a pipe that you can cut to length. Or you can just use the flares on PVC.