Well here is a video of what it can do, Justin Starkey's COMPLETLY STOCK 3.8 v6 engine, 4r70w automatic (transmission that comes with 99+ v6 mustangs) it had just a shift kit, PI torque converter, GT rear diff, and twin 16G turbos @ 17 psi combined boost.
its a 2000 automatic v6 mustang.
http://media.putfile.com/Justin00v6stocktimerecord