Two Bros. Racing Installation
First, get the patient in position.  Had to move debi's Dang Wang out of the way.
Get tools:
Place Pabst in a safe position.
Remove flange cover trim:
Remove stock big ugly can.  Start of number "TWO" Pabst.  I think that's how Two Brothers Racing got their name.
Cut cat 1/2 inch from flange:
Ouch!  Made me mad.  At least I didn't scorch my forehead.
That stuff's hard!  Wore out 4 blades.
Grind/file to remove any flash and burrs that could restrict flow.
Completed installation:
Perform qualification test by riding:
I guess I'll leave on the pipe for a while.