The AC12D subs are an excellent choice for your car. The bass is loud and deep with zero distortion. They have an elegant design and are affordable. They are rated with 1800 watts peak power and 900 RMS total power handling.
The enclosure specs do not require a lot of space and they can be installed in a ported or sealed box. The subs can be wired from 8 ohms to 2 ohms in a single sub or 4 ohms to 1 ohm with multiple sub-woofers. Would highly recommend this product.