Put a GReddy Turbo Kit on my F20 in the S2K about a month ago. After hitting the dyno for a tune I started having issues with Vtec engagement. When I hit Vtec the AFR's hit 10 flat and it acts like its missing or something. You can hear Vtec engaging in that the engine picks up and gets louder but it acts like its holding back. I've changed vtec crossover points, changed engagement options, even put the stock ECU back in and it does it regardless. Any ideas? Its been tuned on an AEM EMS.