Included in the kit is:

Solid billet MAF housing with embossed logo.
High performance filter
All sundry items needed to fit it
Fitting instructions
Optional High quality silicone induction hose
The benefits from fitting this kit are:

Removes ugly original plastic & restrictive airbox
Adds power and torque, 
More responsive and exciting driving experience
Enhanced induction sound and turbo recirculation noise
Please be warned though, this kit is NOT for the faint hearted!