The Brave is a slow engine. OK, if all are running that one then there are no issues but the old type N21-5T with the 3 port exhaust was faster but its gone now and the Picco PSS is for sure a faster choice than the Brave. I know drivers who have tryed the PSS and did stick with the Brave due the higher costs of the PSS to keep it running.
So now for 2 years they have chosen the ISON21 because Novarossi is a reliable engine, of course all older stock engines on the list can also still be used but are no match for the ISON21.
I still have to get a brave in my hands to measure the timings, I am pretty sure the Brave is lower timed than the older N21-5T