It might be a high flow switch over or pressure dance like you're talking about. I just looked over the log of one I did with a cai only trying to get to the root of something in a near stock car and it stayed right at 50psi until 3400 where it switched over to 60psi causing the injector pulsewidth to suddenly drop. No afr lean spikes anywhere on the dyno readout unless y'all see something, but I didn't' have the widebands hooked up in the log to see more instant info. Most of what I'm seeing in the tune even shows the opposite. Drops in airflow or fuel requirement through the 2500 rpm range. I don't see anything special about it, but maybe y'all will see something that stands out? The pulls were in manual mode, but it was an auto car. I know it looks like a lot of timing in this one, but the guy beat on it regularly racing and never had a problem. I wouldn't run this much timing now with today's fuels.... Just forewarning for anyone who may try to copy something. Even the MAF curve was smooth up till the 11300 hz area where it peaked out.