In docs we read?

9.1.3. Enabling conversation propagation with redirects

If you want to use post-then-redirect in JSF, and you want Seam to propagate the conversation context across the browser redirects, you need to register a servlet filter:

<filter>
    <filter-name>Seam Redirect Filter</filter-name>
    <filter-class>org.jboss.seam.servlet.SeamRedirectFilter</filter-class>
</filter>

<filter-mapping>
    <filter-name>Seam Redirect Filter</filter-name>
    <url-pattern>*.jsf</url-pattern>
</filter-mapping>

so if I don't use JSF redirect instead of seam pages.xml redirects do I neet to implement this in my web.xml?

I also wondering about seam exception filter.
They are default loaded by seam, can I disable them?