Annular boosters on a Tunnel Ram

As delivered, this Holley 650 vac secondary kept the AFR pretty flat at the top end.
But notice that reducing the jets enough the MABs are just at the point of needing to be reduced a little to match.

Mattax said

Here's how much was gained by changing jets.
70,74 to 66, 72
View attachment 1715473374

Click to expand...

This was done on a dyno which of course cost money.
But one advantage over buying a WBO2 logger is easier learning curve and installation.