Here is a video of me Powershifting my Shelby(Closed Track)
Just a quick vid of power shifting my 2007 Shelby GT500 on closed Race Course. 4.10 gears/FRPP Axleback Exhaust/Nitto Drag Radials 305-45-18/SCT Strategy Flash Standard Shelby Tune/Stock Airbox Air Intake. 511 RWHP (SAE). Its easy to powershift and various power levels require harder/faster shifting. Lower HP cars can easily slip into gear while shifting fast... the more power/torque and rpm make it a bit more challenging. Until you have tried it in a car like this... keep comments to yourself. And no... its not hurting anything... 5k miles... 11.20 1/4 mile drag times and no problems. If its done correctly... you will have no problems.

Here is a video of my Shelby on Dyno making 523 RWHP at Dwayne Gutridge's Big Daddy Performance.

Another dyno test on my car with experimental Mass Air Meter and open air filter. No tune... just the factory tune untouched. 100% safe. 523 RWHP (STD) 510 RWHP (SAE) I show back the results of back to back runs with the meter on and then at the end I show a pic of (STD) readings of the first Experimental Mass Air run and my stock air box run for that day(490 RWHP).
Engine was a little hotter than my previous dyno. So she gained 33 RWHP with no tune.
Product should be out soon from BigDaddyPerformance.com

Here is a video of my Shelby on Dyno making 501 RWHP w/just exhaust(no tune)
This is my Shelby's first time on Dyno. 501 Rear Wheel Horsepower (STD) 490 RWHP (SAE) Only mod is a Ford Racing Exhaust (stock Ford Tune) "Big Daddy" Dwayne Gutridge of BigDaddyPerformance.com dynoed the Shelby for me at his shop. Thanks guys!

Clip of my 2007 Shelby GT500 Ford Racing Performance Exhaust Part #5230 5GT.