I have to say I only really noticed a real difference on my intake when I added the Revo intake airscoop at the front.
I’ve also got the MST elbow & hose with performance filter with snow grate removed.
Those items didn’t really make too much difference, maybe a slight improvement top top end of the Rev range.
Recently added the Revo carbon cold air scoop and it now feels much stronger throughout whole rev range.
I understand some people modify the stock air intake by drilling to achieve the same effect (opening up airbox side of the intake that is blocked off) so maybe it’s worth doing that also.
I wanted the carbon scoop as it looks amazing