  We consider a symmetric scalar theory with quartic coupling in 4-dimensions
and compare the standard 2PI calculation with a modified version which uses a
functional renormalization group method. The set of integral differential
equations that are obtained from the exact renormalization group method
truncate naturally, without the introduction of additional approximations. The
results of the two methods agree well, which shows that the exact
renormalization group can be used at the level of the 2PI effective action to
obtain finite results without the use of counter-terms. The method therefore
offers a promising starting point to study the renormalization of higher order
$n$PI theories.
