I recently ordered a JLT cold air intake for my 2021 Mustang GT. I’m not sure if I’m REQUIRED to tune or if it’s just recommended. I do live in Phx AZ lol.
The jlt intake is usually a tune required intake due to the larger tube for the MAF. There are some intakes that have an insert to use so you don't have to tune. These intakes typically don't add much though on the dyno maybe 5 hp real world especially in the south might lose power on the street due to high ait and the car pulls timing.
I have the JLT intake on my car and a tune is required. I tuned my car a month after I got it so adding the JLT intake wasn't an issue. I think you can get the insert so it will work without a tune.