Octane Level for Upgrade? Bill,Corey? Help?

[SlvrBrute]

Well I am going to send in my Evo for an upgrade to the Gryphon in the next day or two but was wanting to know what octane I should select for my custom performance tune I am getting? I am getting just one tune for my mods because that is all I need but I run Super Unleaded (89) all of the time because it is the cheapest and didn't know whether I should get that octane performance tune or just leave it at 87? I just talked to PHP and they said that there isn't going to be that big of a difference but I just want to make sure before I send it out? Thanks