Stunning Fist and Monk - Potential Level Increase?

[Kazumetsa Raijin]

Is there any feat or item that can increase the effective level of my Stunning Fist as a Monk?

[Gilfalas]

Kazumetsa Raijin wrote:

Is there any feat or item that can increase the effective level of my Stunning Fist as a Monk?

The Ability Focus feat from the Bestiary could do it, depending on if your GM allows it.

Edit: Sorry, I misread your post. I thought you were looking to increase the effective saving throw.

[Imbicatus]

Mantis Wisdom lets you count 1/2 your non-monk levels as monk levels for stunning fist. The entire Mantis Style tree lets you have extra stunning fists and increases to hit, DC, and lets you use additional abilities with it.