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THe rx 7 Turbo II coolers work well and there still around also the older mercedes ones but usually a little more money ... Another option is the saab turbo Intercoolers with welded fittings or 2 944 turbo coolers
If you look behind the grille of a Jag XJ6 with a 4.2L they have a nice cooler. Like the KISS, but a little taller and with ~3/4 fittings...