I've been searching but haven't found a definitive answer.
I'm just wondering when a person will start seeing noticeable gains from tuning. I currently have an LGO and have added the HO intake mani, a 3" intake, the HO EX exhaust manifold and 2.25" exhaust from the manifold back.
Should I be looking to get a tune, or will it be a waste of money at this point?
Unless you have a pretty crazy NA build (custom cams, race ported head, 13:1 compression, etc.) or a turbo, you will not gain much at all. Maybe like 5-10 HP MAX. For the 350 + price tag, your money is better spent elsewhere.