I've been running a perrin stage II map for a wile now, but I know that if i can get someone to help me protune my cobb then i will be able to pull a little bit more HP outa my subie. I dont have any problem with air to fuel with the stock BOV but i have a SSQV and like to use it but without a protune there is too much backfire and the air to fuel numbers go crazy. Please please please email me if you are in the VA or DC area i will be willing to drive to you for help.