hi i got a 1996 dyna , had it for a year now, and done the usual mods. Andrews 46 cam, Hooker pipes, S.E air fitter,Ignition Module,Performance Coil, JE 10.5:1 compression pistons, Mikuni HSR-42 Now it come to the heads, i had a mate do a 5 dergee angle valve job. the question is now is it worth getting performance valves or S.E heads. and if i do how will it effect low, mid range power. I mate of mine said if i get performance valve or S.E heads it take away low mid range power and moves it to the high end range is this right.