Yes and no. The dyno software was set to 4wd parasitic losses for the open header pulls and the headers with stock exhaust hooked up. The numbers don't mean anything. After this discovery another, well around 10 further dyno pulls were done. The initial numbers were less than the before dyno. After adding fuel via methanol a gain of 4 hp. I ran a 1/2 mile event and ran 1.4 mph faster with the headers. Not a whole lot. A little. I'll be going over the car carefully to be sure I don't have a boost leak or other problem before I do anything else. I was shocked by the 40 hp and I'm equally shocked by the 4 hp number. The headers are up against the firewall on the drivers side so I feel a little vibration. I was told the heat shield needed to be removed but I decided to leave it on. Mistake. The install took 12 hours. The steering box has to be loosened and moved. The primary O2 sensor bung is in one of the tubes so you see more fluctuation in AFR's from the pulsing from only one cylinder. The headers are beautiful and the welds are excellent. The communication with Dyno Comp has been excellent but we haven't spoken since the instal and they don't know the results yet. I've got lots of hair pulling to do and things to check. The car seems to be running rich even with AFR's on the lean side so I suspect leaking upper manifold gaskets. The new gaskets will be in my hands before too long and I'll either have to except the current reality or be relieved that I was leaking boost like crazy. My boost gauge shows 17 psi down from 19 psi.

Les