Twin Scan II+ backpressure

[waskier01]

I was thinking about the old sheet metal screw trick, to try to build some back pressure.  95" build with stock headpipes (w/02 bungs) and vance & hines basic slip-ons.  I'll pull the baffles out and screw in some 1" sheet metal screws.  I'll start with 12(?) left, and 6(?) right.  Any suggestions?