I ran the Super Sniper on my 470 with the Trick Flow 270 heads. That engine made 730 hp with my Dominator and then 710 with the Sniper. I had to use a 4500 to 4150 adapter which kills some power. The Sniper is a tad small for this engine which also kills some power but 710 isn't bad for a low cost throttle body system.

The Super Sniper is rated at 650 hp but there is some margin in that number. My engine was using 85% duty cycle on the injectors at 7000 rpm so there was still a bit left. The airflow was about maxed out though based on the pressure drop across the throttle. The Sniper has a nice data logger so after a dyno run you can just play it all back and look at the manifold pressure, fuel pressure, fuel flow, air fuel ratio, etc. and see what the engine was doing.