Not every modification. If you straighten the flow before the throttle plate you might see an efficiency gain because it isn't turbulent at the map/maf sensor and so could signal leaner operation. You can also get a pressure boost. I suspect the throttle plate causes swirls and eddies even full open
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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