the whole setup from header to exhaust tip is dyno'd (with cats in stock locations) and is in post #2 of the header thread:
http://www.ft86club.com/forums/showthread.php?t=9179
The whole system (catted header, catted downpipe w/overpipe, and axleback) sounds like this:
[ame="http://www.youtube.com/watch?v=98lXkLVhmzc"]Modified Subaru BRZ handling oval - YouTube[/ame]
No vids of the system with the helmholtz yet.
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First white BRZ in the country
Limited SWP BRZ, 35% tint, clear bra, Nameless Performance downpipe, axelback, headers