I was wondering what my options were for my G8. I want to make sure what items are compatible and what will be the best package possible within my budget and wants. I already have a CAI so anything in addition to that would be great.

Given your $800-$1000 budget, the upgrades that we'd recommend which would represent the best value for money are shown in the links below. These upgrades are 100% comparable with your Pontiac G8 V6

12mm Manifold Insulator

http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/MI603

OR

25mm Manifold Insulator

https://www.maceengineering.com.au/epages/mace.sf/en_AU/?ObjectPath=/Shops/mace/Products/MI603

Remote custom tuning service for VE Alloytec

http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/PPF601/SubProducts/PPF605