ECU will adapt to a minor change like that. Basic intake/exhaust bolt-ons are not worth a custom tune.
I thought the something too, but then I had my Sierra Black Bear tuned (the guy flew down to NO for a group session). I was already getting a tune and what not, but there were some issues with the intake and my stock tune, and we had to ride around in my truck for a few extra minutes so his program could work it all out.
He told me sometimes the intakes end up doing more harm than good and you end up running with a messed up mixture.
I guess it depends on the intake.