Slower after header install

[Gojiras breath]

If your engine has a mass airflow sensor it will see any extra air and compensate. Same goes for wideband O2 sensors.

If it is speed density that may be true. Or a carbureted engine. Headers probably won't change it enough to matter though.

A lot of people say the car "runs rich" with headers or without cats...

Ok. Maybe its an issue with the fuel pump. Needing more fuel it can't provide. Not trying to remedy it here. Thought it mighy apply to the OP.

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[Junkyard Dog]

Your first run, in addition to 42° air and a density altitude below sea level, is run on a 1% downhill slope, with gravity assisting by adding 0.17 m/s²

The second run is half a degree uphill, gravity dragging 0.0787 m/s²

 

[Junkyard Dog]

LOL, I just noticed the "Height(ft)" green/blue line. You can see the downhill run on the first graph.

 

[Trillbro]

LOL, I just noticed the "Height(ft)" green/blue line. You can see the downhill run on the first graph.

I also ran this one that night starting in 2nd gear with a negative slope. I was just hoping to pick up more with the headers. Guess I need to pulley down and then

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