i dont know about the banshee's yet but i run diamond in a 360/408 stroker sb mopar with 100-300hp of the laughing gas have 5 yrs on them several other problems but same pistons one even has a little ding from a valve still np
im in idaho ride mostly 4800-6000ft fmf fatty pipes kn filter no lid +3 timing coolhead with 18cc domes stock pilot and need mains 260 have had it that way for 3 years its a 2006 not one problem and running 91fuel