Diablo Predator tune at high altitude

I was wondering if anyone knows what a good Air/Fuel ratio is for the Diablo Predator at high altitude. I live in Colorado and Diablo Sports recommended me a custom tune since their website downloadable tune has been customized for lower altitudes.

I know a dyno would be best, but just wondering if anyone may already have been there with a car comparable to mine (stock except for the K&N airfilter) and could provide some good A/F numbers?

I did email the Diablo team and got the response where they recommended a custom tune due to the higher altitude. After the install the car sounded like it was not getting enough air, so I uninstalled it again for the moment.