fixing to freshen these motors and add superchillers, what gains can i expect im running 5#s boost now stepin up to 7#s heard that with the coolers would loose some boost? am i wasting my time.

Nope. Chiller with lower your boost, then crank it back up. Worth every penny.

I still have a pair of Superchillers available. $2750 for the pair shipped.

why did you pull them off?

Put engines back to stock so they'd fit under hatch for trade in. They were on 575 SCI's.