I installed the SE ign. module in my bike (98 FXSTS) almost two years ago.
At that time the EVO was just a stage I. I 've not had any problems with ping (detonation). Seat of the pants said it pulled a little harder.
My buddy has an older EVO and installed the SE in his bike. He likes to lug
his a lot and has had no problems.
I have recently done a rebuild upping the compression to about 9.1 to 1.
I still don't have any issues with the SE module.
IMHO - Do it, you'll be glad you did.
PS: my obsolete EVO will toast 90% of the cagers out there.
1998 Obsolete EVO Springer
Now boasting the Al Gore enviromentally friendly engine.
In the South, it is "Merry Christmas".