It may not be relevant to your situation, but when I had the issue of air getting into the system on my GTT, I found there was a tiny hole in the aluminium cooling pipe. Enough for air to be drawn in, just not enough to cause a significant leak.
Looked like the previous owner had chosen a bad place to attach the earth clamp of his welder and tried to mask this with a piece of mesh sleeving 🙄
Greater amount of energy is required to turn larger wheels up to speed, there for laggier. However bigger wheels are capable of flowing greater amount of air through both housings, let the engine burn more fuel and makes more power that way.
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