This would likely get more traffic in the main chat thread vs technical.
But, Flat6(Jake Raby) might be worth a call. My understanding is moving to the e-gas is not simple or cheap. You can upgrade a 3.4 from a 996 to at least a 3.8 and possibly a 4.0. There are people on the forums that have them. They are all apparently sworn to secrecy about how much power they put out but they seem very pleased with the results.
Like you I have a 99 Boxster. It happens to have been made the month and year my wife and I got married so now she won't let me upgrade from it lol! Admittedly, I also love the car too much to sell it. So I've been looking at the same options. Right now, my goal is a flat 6 innovations upgrade to a 996 3.4 motor. But I'm probably at least 5 years out. Buying son's truck some time in the next few months. Then saving for a Bronco. Then the engine for the Boxster. So, maybe only 3-4 years.
F6I isn't the only place doing rebuilds(Vision I think does?) and if you're comfortable doing the work you can likely do it yourself. LNEngineering sells rebuild kits for all different years including upping the displacement. If I retire early, maybe that's the route I'll go lol!
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