New '04 GLS 2.2 & Turbo Kit

I'm thinking about buying this nice black '04 GLS Coupe with only 77,000km on it. It's an Ecotec 2.2l, 5spd which seems kinda weak to me. I found a T3 Turbo kit for the Ecotec for $800 - which is said to add 100hp at 8psi. Any feedback? What kind of output can I expect and what supporting mods will I need (other than FWI). Also I wouldn't be confident installing this myself, how many garage hours can I expect?