hey guys i recently came up on 2 18" fi btl's for 600, the 1st gen. sooo i got a 01' jeep grand cherokee and im wondering whats a good size box for my truck. i dont need my trunk so i just need advice on whats a good size box for them, and what they should be tuned for. thank you for any help you can help with. also i have 2 soundstream rubi.2500 to power each sub