two Audiobahn AW1200Q 12 subs

Aren't those subs single voice coil 4 ohms?  If so, you will be wiring them for 2 ohms.  Post and let the forum know the coil configuration.  But even if so, it doesn't really matter if that is a mono amp, and the model number with the D on the end makes it appear to be so.  It would handle a 2 ohm load.  Look at the wiring app to the left under "woofer wiring", enter your sub type and you will get diagrams to choose from.

What are you doing about an enclosure for these subs? 

Okay that wiring for the subs.  The amplifier will thank you in the long run by performing at its best that way.

If you go with a premade vented box you will likely end up with about a 2.5 cu ft box tuned to 40 Hz.  Sound will be extremely peaky at ~60Hz and will be difficult to enjoy.  The most you could claim with this setup is loudness.  I suggest you look for a sealed box for these subs as they model best for a sealed enclosure.  Size is important, so get one that has, at a minimum, 3.5 cu ft.  I'm sure somebody makes a dual box that size that is solidly constructed.  Look at the construction:  it's important that the box is built with 3/4" MDF, not particle board and not thinner.  A major bonus, and an important consideration, is that the box is built with internal bracing.

Your gear can be set up to make a really good sounding sub bass system.  Couple that with some attention to the main speakers, mains amp and source unit, and you'll never need to apologize for your choice of brands.

Make sure your car's battery is new or almost new.  A three year old battery is at life's end.  You'll need some basic upgrades to the car's electrical wiring...see the Big Three sticky above on how to approach that.  The alternator will let you know if it needs to be upgraded.  The symptoms of power starvation will clearly show when you are running headlights and music system at the same time.  Capacitor - no use for that.

Use this site's extensive help section found over to the left in the blue column.  You'll find a section on power and ground cable requirements.  With that you can select wiring and fusing.

With all that, buy damping liner too.  There will be sections of car sheet metal that will literally groan and rattle when bombarded with high level low frequency tones.  Quieting the car's body will make the system louder and sound much better.