What Size Cap for 1099 Watts

You shouldn't notice a difference in fuel economy. Hauling around the amps and the subs already took care of your mileage. If you are going to add more amps, you don't have too many choices. Don't forget to upgrade your main battery ground and you should have a min. of a #2 AWG off the Alt. to the battery. The Big Three; learn it, know it, install it! Unless you listen to the system with vehicle off, a second battery is not suggested.

I already intended to upgrade all of the wiring to 1/0 gauge just to be sure. Thanks for the advice. If I could bother you one more time for a small piece of knowledge. I was thinking of running a 1/0 ground wire directly off of the battery to ground all of the audio components too, is that recommended or would it be a waste of pretty expensive wire and time?

I have heard two schools of thought on the subject. Your vehicle's frame contains alot of metal, steel. Not the best conductor, however the frame has soo much metal it is acceptable. Every install I have done has been using the vehicle frame. Strip off the paint on the grounding spot on the frame. Bolt on your ground wire with heavy duty crimps Repaint the bare metal. Don't use seat bolts! Look for posts reguarding grounds. Other's have run wire directly from the battery ground to the Amp. Is there an advantage?, depends on the vehicle construction or the installer. More money, time, materials etc. I'm running #1 AWG welding cable with a 150A fuse off the stock battery with a 160Amp alternator to Zapco C2k-3.0,4.0,6.0. and have zero noise problems and zero dimming. #1 AWG from custom ground block to frame with 1/2" bolt. Cables from Alt to battery, Battery to frame are all #1 AWG. Good Luck!