Subwoofers in a cruiser mopar

I had a 10" JL Audio slim sub box behind the rear seat in one of my cars. It was fine if you wanted to add a little bass.
If you want to go to a good car audio forum try DIYMobileAudio.com Car Stereo Forum. I spent a lot of time there when I went down the slippery slope of car audio design and DSP tuning. I spent many hours tuning the stereo using my laptop with acoustics software and an acoustical mic to record the audio signals.