Wrote a message to Tony Mamo @ Air Flow Research (maker of AFR heads). He replied with the following, which didn't make me feel better, but gave some insight into why I'm seeing the smallish gains:

"Shorty headers are useless and the big question is why didnt you baseline the combo....That trans will sap lots of rearwheel power as well....especially with a converter....are those locked or unlocked numbers??

I think the results are in line all things considered....A vette with a baby cam and an A4 with shorty's would be lucky to crack 400 RWHP. I bet your driveline is sucking 140 HP from the power eqaution...LOL

You get the picture....

Good luck...keep me posted

Tony
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Tony "Morpheus" Mamo invites you to take the Blue Pill...welcome to the "real world" "