those with prochargers using the provided tune from them question for you
 

how close was the tune they send with it?

:smiling1::smiling1::bonk::bonk::bonk:

Bout that close.

But seriously....it's BAD.

It's shit...never buy a supercharger for the LT1 and run it with a supplied canned tune or stock fuel system. Half the time they don't even enter PE mode. And when you tune them correctly, they are basically out of fuel...especially in cooler weather.