From HD website


Screamin' Eagle® Stage I Air Cleaner Kit - Twin Cam Models

Kit features a one-piece cast back plate with integral breather and mounting brackets for simplified installation, and an air cleaner element that does not require oiling. If you want more torque from your Twin Cam-equipped model, this kit provides a freer breathing capability to pump-up the power of your EFI-equipped motorcycle. This kit includes air cleaner, breather, and all required hardware. Street legal when used with stock mufflers. All EFI-equipped models require ECM calibration (priced separately). Regulatory approvals pending for '08 models.

 

What would be the results if you did the download and left everything stock? Would the mixture be richer?

 

Fastbagger was the picture in the catalog one of those split manifolds that have two cone shaped air filters on it facing forward?

I have no idea about the stage one download. That's more top secret than area 51.

 

This

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This is the one I was referring to that's featured in American Iron Magazine that adds 10 HP.

http://www.sscycle.com/ Its the one in the upper left that says "Feautured".