You should get those O2 sensors replaced when you get the headers fixed. You're probably running rich. Especially if you saw a lot of fuel coming from the exhaust while you were on the dyno. I'm just guessing but they're probably the original O2 sensors that came with the car 7 years ago.
Shifting should occur at the point when you will be making equal power at the wheels in the higher gear. You'll need to know your gear ratios and have a dyno printout to do the calculations.
Your hp curve peaks and then drops off. You'll want to shift at the point after the peak where in the...
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