I sold my X5 and don't have the use for this. I had it for about 8months. I made this according to the directions on the forum. It fits in perfectly. Good solid sound. It weighs 22lbs. Shipping will be high because of the weight. Its an 8" Subwoofer (8W1V2.4). I would think it would be about $40-$50 for shipping.
Willing to accept reasonable offers.