Originally Posted by Paul Ripley

In terms of power difference what are the stages in terms of power?
Is a standard inlet is 24mm? good for how much power?
Then you get polished versions.. good for how much power?
Then opened up to 25mm? good for how much power?
Whats next?

This is mine:- measures 25mm top to bottom and is very polished and smooth and my inlet manifold has been matched to it