If you are refering to page 13, the dyno graph is of v1 tune and v2 for his HKS kit. Mad dog didnt install both kits for a back to back comparison. One of the reasons for his top end hiccup was his plugs.
Also if you read the thread, many people agree to the conclusion that the HKS does produce more midrange...including the OP your qouting. Which is why AA chose this kit, to give an option to those who do want more low/midrange power compared to traditional centri based kits.
The C38 you listed is for E46 M3 FYI..E36 kits use C3871, now the only one using C38-81 is the 330 based kits.
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