hi all,  some advise please have a 2011 Heritage rpm seems a little to fast, hot    =1030 /990  i have S/E slipons if i add SEPST, S/E Heavy Breather, can i drop the rmp down to say 950 with doing any harm ?  any advise appreciated

As long as you don't go blow 900Rpm you will be fine. Below that you risk lack of oil pressure and then problems arise. I run mine at 984, but have run at 972 which is a nice idle.

 Run mine at 944.........never goes below 900 (2012 Fatbob has a tacho).

Would depend on cams too, I'd imagine.

Burto.