I doubt lower than ambient temps with any air to air but with mine running a stratified e30 tune on stock turbo I generally run between 1-4 degrees over ambient temps cruising and a full 4th gear pull from 2500 rpm to redline I only raised about 7 degrees from what my starting temp was at the time and I've tried this on multiple occasions....2nd and 3rd gear pulls rise even less. It is a wonderful intercooler for the price for sure as is the whoosh (which was not available when I bought my depo a year and a half ago).