I only ran about 24 hours in all stacked. The power at low rpms was blinding. After watching my AFR on the gauge I became concerned. Not so much at WOT but at part throttle with lots of boost the AFR's were still around 14.7. At the drag strip I ran the same times as with just the 178 pulley. The car pulled hard down low and the power trailed off near redline. I didn't want the problems of tuning for the injectors that you need to run stacked safely. In other words a tune modified from idle to redline, part throttle, actually all conditions. Now that the tuners have done a few of our cars it's less of a worry.
If I was looking for 1/4 mile results I'd run stacked with 550cc injectors or nitrous. Grip Grip, for one, had both successfully.

Les