I'm a bit confused now as I have seen several videos at Youtube and several FRST that were allegedly stock did not have any chatter at all when lifting to change gear. Can someone please confirm whether an absolutely stock FRTS should have chatter??

I used to own a stock S2 ERST long ago and being MFI it had no chatter, but for sure it had a quite loud and nice whistle around 3000 when it spooled up and then it pushed you well against the back of the seat. The FRST does not push you hard against the seat, and the spooling up noise is nearly absent but maybe I'm expecting the wrong feel, I don't know.