Here is an older video of my car...I have changed the aesthetics of the engine, and a few things in the interior to make it as close to stock 1966 in appearance, but it is essentially the same sound. The mufflers and pipes had not been ceramic coated yet either.
Basically, a 500HP 1964 427. Before I bought it, the car was close to 600hp with a different cam, carb, etc. but it was tuned down a bit. Exhaust...Headers and 20" unpacked glass packs from Classic Chambered Exhaust.
I hope this helps....it is hard to get the full effect of the motor and exhaust note through a $149 Flip Video camera:
1966 ERA 427 Street Cobra - YouTube