does it really matter what kind of air/fuel module you get? cause i seen some for under 200 bucks and im thinking about buying it.

 

As long as it's a wideband A/F, you're good to go. Also, make sure it has a 0-5v linear output. This may come in handy in the future should you get the Greddy EU or another piggy back system. Stay away from the Zetronix Zt-2 Gen I wideband, it doesn't have a linear output (if that matters to you).

What are you considering?