Quote:
Originally Posted by Martin White
For what it's worth, my preliminary data on my 1HD-T with upgraded exhaust (with a huge power increase) is that fuel economy is not significantly better or worse, although as Wayne says, once you have the power, you use it, so that may have some impact. But overall it looks as if the fuel consumption is about the same. I do see a possibility that under ideal circumstances it could be quite a bit better (cruising at approx. 60-80 kph under partial boost on flat ground).
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When you're running at partial power levels (i.e. cruise) the gas flows are lower and a large exhaust offers no benefit.