Warning: This is 3.0 Edition material. It is possible that there is more recent 3.5 Edition version.
Inaccurate?

Superior Initiative

( Epic Level Handbook, p. 67)

[Epic]

You can react even more quickly than normal in a fight.

Prerequisite

Improved Initiative (PH) ,

Benefit

You get a +8 bonus on initiative checks. This bonus overlaps (does not stack with) the bonus from Improved Initiative.