When do u need to dynotune

So I was wondering when do you need to get car on a dyno?
I have done all basic mods.
Exhuast- extractors, cat, and 2.5 exhuast.
Air intake
20% under drive kit

Again these are all basic but should I get in tuned?

Thanks

Car: ford falcon fg xt

You can tune a car at any time if you want to extract maximum performance from it.