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I think what you said about having to go inside the motor to reduce compression is a significant hurdle for most enthusiasts who would prefer bolt-on DIY arrangements like the current supercharger kits.
For turbo'ing there is a host of other issues which require custom built parts, which by comparison retrofit from a 930 onto pre 89 911s making them viable turbo candidates. Having BTDT I found that nothing retrofits onto the 3.6 platform so you'd require custom headers, oil scavenge system, engine tin mods, inlet pipe, intercooler, etc and there is difficulty with space due to the twin head distibuter, clearance issues with factory heat ducting components and space for a decent intercooler, list goes on and on. Even the intake manifold has issues as it was never designed for pressure so all the rubber unions pop apart much above 6 psi.
The 911 and 930 chassis are free of clutter whereas the 964/993 are more like modern cars with space constraints, just more custom stuff to deal with which would become cost prohibitive.
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