I'm planning to do this when my diesel budget recovers. They say that some power gains are likely on IDI engines, but most of their experience is on DI engines.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine