I mean, the goals are usually to get as much air available in, at some velocity, and in a way that it’s going to spread fuel evenly once it enters the combustion.
A measure of rotation helps that mixture and can compensate somewhat for an otherwise less than optimal intake path. Swirling air tends to naturally distribute itself better due to having some inertia as opposed to relying solely on pressure differentials. That’s why I was suggesting it, not as a replacement to the stinger but to simulate some of it’s benefits.
I’d be curious to see what the back of the throttle body is like going to each cylinder.
