I went to twiggs today and drag raced the z. By the way I highly recommend twiggs on sunday. The car ran great with one exception, the car ran so rich at 6000 rpm at 15 psi, like at shift rpm, that the car would bog down. I logged in to tunerstudio and tried to lower the fuel but had the same results. I''ve read a lot about this problem but no fixes. PLEase HELP . Thanks