The Export Map allows much more granular control over which networks get advertised to which vpnv4 prefixes. There's a great example at http://www.cisco.com/en/US/docs/ios/mpls/command/reference/mp_e1.html#wp1012602
I learned a bit more about the order of operations of MPLS during this exercise. I mistakenly forgot to import the route-targets on R3. During troubleshooting, I noticed that the routes that were supposed to be imported were not present in sh ip bgp vpnv4 all. Apparently this table does not get populated until the specific route-targets are imported by a vrf.
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You can use the command "no bgp default route-targer filter" and you will be able to see the routes using "sh ip bgp vpnv4 all" command
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