ATP's boost-actuated cutout has one major flaw that people seem to overlook... it takes away the most essential advantage of dumping exhaust gases into the atmosphere as close to the turbo as possible: spool-up. If the butterfly valve actuates only once boost is begun to be created, it does very little to nothing in order to aid the spool... I'm sure it'll still make more power than a traditional TBE though. Now, if you have that same butterfly valve wide open before going WOT, I guarantee that spool will be aided, torque will increase, and perhaps overall power as well.

The downside, of course, is... all electronic cut-outs eventually fail. Don't worry though, they're cheap to rebuild and easy too.