NO no no. Greddy leaves out important parts.
The best full kit you can get is the Edelbrock kit. Then buy a MBC and boost around 10psi, youll be at 180-210hp depending on boost settings and stuff. Best part is the edelbrock tunes itself (to 10psi). So you won't pay for tunning stuff.
but custom turbo means parts YOU want, and its cheaper, and will give you more hp.
Check out
www.turbod16.com or
www.homemadeturbo.com