I'd bet you your entire life savings that car doesn't make 500 RWHP.
Didn't you just say it was on a 3.4" as well?
...Cobra Eaton M112 Supercharger 5-6psi, inlet and throttle body, GT take-off exhaust, Focus 310lph fuel pump, Modified 99 Lower intake, Custom Aluminum Upper intake, Cobra 39# fuel injectors, Stock Cobra pulley (3.55"), 90mm Lightning MAF
Those mods made 261 RWHP/282 WTQ...and a .15" drop in pulley size make what...275 WHP/300 TQ?
Also...did he build the bottom end? If it is making over 500 RWHP, then it must...because the Ford 3.8 can't handle more than 400-450 RWHP before letting go...according to plenty Ford enthusiasts.
I'm not trying to kick you in the nuts, but man...I'm giving you all of this info to read and learn...and you just choose to ignore it and hope someone holds your hand through the whole process. I understand a couple questions...but you need to look into stuff for yourself as well.
As for the mouthy part...kiddo...you ain't seen anything there yetI also have no beef with any Mustang anywhere, in fact my old man owns a Kona Blue '11 M6 V6 car...with bolt-ons...and I'm sure it makes around 300 RWHP. What I don't care for is outlandish claims and people who get mad when I tell them to go research a little...I'm not stapling your tie to the desk when your asleep and then slapping you...I'm just trying to help; which is the reason why I took a couple weeks out of my own personal time to type up that thread people have linked you...you know...so you can learn too.
But whatevs, it's your call.