You can dyno it immediately if you wish. The computer will learn closed loop for a little while, but open loop, which is your foot to the floor, is commanded in the tune and isn't a learned parameter.
i am still driving around after 4 months on the milehigh email tune.I have added a 2lb lower jlt intake after the tune and it seems ok, should i retune?
Neither of those should effect the tune. But, I would still recommend hitting a dyno to make sure everything is OK, considering you've changed intakes.
It is always a good idea to check your tune after installation! Every car is a little different and may require a little tweaking on the fuel tables to get maximum efficiency. You want your a/f ratio to be in a safe spot! We have some great tuners on this website that will glady upgrade and tweak your tune to get your car running great and safe!
I have had my car for 3 weeks and I it seems that it would be a good Idea to buy a tuner right off the bat. Seems like anytime you put on a cai, cat back, different pulley that you need to retune. My question is what is the best tuner and would a tune help my stock 03 cobra or do I just wait for more upgrades.