I have a 98 ram 1500 qc. Im looking to add some bass to my system. I dont want to make a box. But i want one that goes under the rear seat. Are there any company's that make anice fitted box? Second question is should i go with 10" or 12" subs? And is 1 enough or should i go with 2? Im not trying to win competitions just want some good bass. Who makes a good subwoofer that wont break the bank? Do i need slimline subs?