Help with Netflow from Adtran router to a collector inside the firewall

I am having trouble getting flows exported to a collector inside my firewall.  The ip of the collector is 192.168.xx.8.  The ip of the inside ethernet of the adtran is  The inside ip of the firewall is 192.168.xx.1.  Any suggestions?
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PIX firewall:
For example purposes:
Where "9996" is the port you are using for netflow
Where outside IP of PIX =

static (inside,outside) udp interface 9996 192.168.xx.8 9996 netmask
access-list outside_access_in permit udp host host  eq 9996
i would just setup NAT exemption rules on the firewall.  My netflow server is and my outside router has an IP of 70.15037.129.  Here is the access rule and nat exemption rules i have on my firewall

access-list acl_out extended permit udp host host eq 2055

NAT exemption
access-list inside_nat0_outbound extended permit ip host host
access-list outside_nat0_outbound extended permit ip host host

default netflow on cisco is port 2055

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