He is saying the exhaust ports (primaries) are paired differently. On the 
old design port one and two were paired together as were 3 and 4. In the 
new design they paired primaries 1 and 3 together and primaries 2 and 4 
together. The header retails for like $420. Mine is in the mail, I can;t 
wait until I get it, not that Mike hasn't covered this thoroughly, but I 
will take pics. and do a write up on the performance and installation of 
the new header. 

late,
wes




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