If you're doing local delivery with a lot of stop and go, you will benefit more from weight reduction than aeromods. (Although aeromods can also help out a lot) Consider pulling out the seats if you are solely using this car for pizza delivery. You can remove anything from your trunk except saftey equipment (spare tire, jack, etc), make sure you have all of the junk taken out of your car (anything non essential like clothing, etc). All of this removing is free. From there, you can move onto more expensive stuff like replacing your battery with a lighter lithium one, replacing the gears on your car with taller ones, and other expensive mods.
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