this was dynoed when the car was completely stock. done in 4th gear. didn't bother to open up the engine compartment thus no rpm readings.
as you can see at higher speed(=rpm) there are many inconsistent dips on the graph this is where I expect an aftermarket headers would improve over stock headers. but interested to know what other explainations you may have for the "dips"? knocking?
Threaded Mode
