My Z gets to red line with no problem with a flowless shift to the next gear without losing boost between shifts. I love my auto. I have race many cars with the same HP and won because of the auto trans. Everytime my victim would shift to the next gear, my car would simply stay at full boost and pull away at least a half car length at each shift. Sometime a full car length because they had to build up boost pressure again. And guess what, I have never blown a run because I missed a shift. LOL