The 15v version has +/- 1.5v of adjustment, I believe. For me, 13.5v is a little lower than I'd prefer but adequate.
D series are not good swaps for an Insight because everything is backward in the engine bay - the Insight's ECA is basically a baby L series engine, and was one of Honda's first clockwise rotating engines. Routing wiring and hydraulic lines is considerably more difficult than an L or K swap, and the K engines actually have off-the-shelf mounts available. I imagine an L would provide better fuel economy though, so long as you corrected the gearing.
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