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Antonovich: i suggest to be careful if choosing too thick of a spacers. I somewhat expect similar issues as to overlowered car but now with too much of a lift. As in geometry issues like changed rollcenter, too much of an angle of axles to now too high placed diff. And if there are parts to correct such things for cars lowered too much, i haven't heard for such for too lifted twins. And if "safe/reasonable" range to not require other parts is often considered within 1" of lowering, i guess it might be similar for lift, as in still reasonable if within 1", even if even thicker spacers exist, eg. like your linked 1.5" ones. Probably because they are reused from imprezas/foresters with similar sized topmounts.
Of course, one is complete rally build with most of suspension parts designed custom anew and strenghtened and with proper suspension knowledge behind .. but if you are in this thread, i guess you plan for "mild rallying" with mostly stock parts? Then imho springs like these + some extra engine protection plate + being reasonable with not too much offroading/jumping should do.
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