I just switched from a 12 disk closed cap to the SuperTrapp,5",OPEN CONE with (No Disk) on my Super Trapp V 5. on my 04 VRSCB

This netted close to 5 hp gain and really helped smooth out a dip in my 4000 - 5500 RPM range.

I went from a:
012.drf Max torque of 77.63 and Max HP of 109.05 to a
014.drf Max torque of 81.55 and Max HP of 113.08.

How many disk would I have to run with a closed end cap to duplicate this performance?

Thanks for your time