Stage 1 will work on a turbo lite (180 hp). Your hp will be the same as adding a Stage 1 to a '04 GT, 235 or 240 hp (depending on who you believe). My mpg went up 2 mpg after adding Stage 1 to my '03 GT. I'm running a 2 1/2" Heartthrob catback single flow through exhaust and have Adam's UCP (throttle body to intercooler pipe). As of right now I know of nobody selling a intercooler pipe on the hot side of the intercooler.
This is a pic of Adam's UCP with my HKS bov on it. It is awesome and my GT really pulls harder through the gears now.