Reed valve stuffer question

[0weng]

Need help understanding what does reed valve stuffer actually does on the engine performance. I have a 21mm cp polini and stage 6 intake with the 28mm stuffer installed. I wonder if I am better off installing the smaller one(24mm id) vs the bigger one(28mm id). But offcourse the main reason of this post is the basic understanding how the stuffer works for future fine tuning knowledge. 

Thanks in advance

[aeroxbud]

I think it's about matching the intake size for best flow, and keeping pressure up. So go with what's closest in diameter size to the intake.
I did try it with the different stuffers. And without. Can't say I noticed much difference to be honest.

[0weng]

Thanks, that saves me atleast half hour or more If i were to change/try the stuffers. If thers no significant difference then it is not worth wasting time. 😁