[SlowTsi]

I have been thinking about this all day and its bugging me... I have looked at all the dyno charts I have here for the F's... I find a few things very interesting... #1 The torque curve is absolutely the WORST curve I have ever seen, it should be flat. #2 The headers gain only 5 HP all the way up to 5200 rpm ish... That seems really odd because you would think the power increase would be linear..

At what rpm does the F get "on cam"? Just like a turbo car, the more agressive the cam profile, the more important your exhaust path is. IE, you are going to be seeing larger increases when the car is on the more agressive cam profile.

Also, the torque curves are similar, it's just the different scaling on the graphs that is exagerating the differences. You can see two small peaks in the torque curve on your DD dynno, but the two peaks on the other graph are much more visable due due the differences in scaling.

 

[SlowTsi]

I bet the funky torque curve has more to do with the 'micro-processor' than the headers themselves. We need to see an overlay of that dyno run with the AFR. . .

I am sure the "micro-processors" are in fact just O2 simulators to keep the check engine light off. O2 voltage is typically not taken into account for WOT operation anyways.

 

[SlowTsi]

The problem with that is my torque curve never drops in the middle....... his drops 20-30 ftlbs in that valley... That should not happen....

Let's hope your fab skills are sharper than you observational ones
On his dyno, the drop form the first peak, to the bottom if the drop is 10lt/lbs., it then rises an addiitonal 25wtq to peak, this equates to about a 15wtq difference between peaks.
On your graph, the decrease is a little less than 10wtq (hard to tell with the much different scaling/graphing), but indeed increases the same amount form peak to peak (15wtq).
There may be a couple ft/lb difference, but thats is hardly a big deal, especially since long tubes could certaily effect the powerband before/near peak torque
Ofcourse, why would you have something negative to say about a competing product