yes, additional voluntary contribution,Bayaran Caruman pilihan sendiri, on paper is max RM60k per year.
but i was wondering if we just  put in more than the capped RM60k for that year, is EPF really going to find out or penalise  us?
i doubt it, i think the excess would still draw dividends the same.
Get KWSP 6A(1) form from KWSP or even banks, fill it up and pay. as easy as that. No need any approval from whomsoever.

If your company wants to pay extra EPF for you, then need to fill up KWSP 17(Maj), submit to EPF and get it gazetted as your new rate to be paid at that rate once it is gazetted. To reduce it back company must fill up KWSP 18(maj) and get EPF approval, you cant just simply up or down your contributions.

If you as an employee volunteer to contribute above standard 11% rate, fill up  KWSP 17AA(Ahli) and again get EPF approval. To reduce it back get form 18 (Ahli).