I too had assumed that it was an optomistic jump in power. However, once I saw those mods making 160hp at the wheels on the D16Z that's nearly a 50hp gain at the wheels. (D16'Z stock is around 110hp)

Now an Accord makes 138hp give or take at the wheels in SOHC Vtec tune. Figure that the larger rotating mass of the F-series will loose some efficiency I still think 170hp at the wheels with compressionm, head work, ligher recipricating mass, and better exhaust doesn't sound all that bad does it? Especially concider in addition to better flow your making w/ 11:1 compression, that's an amazing jump for a 4cylinder of nearly 1.7--seems pretty good to me.