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MKIII Supras are certainly on a "downward spiral" of sorts, and that's to be expected as these cars reach the age they are. Particularly 7M cars - there is basically no such thing as an original un-rebuilt 7M-GTE anymore. They've all been used and abused and reached the point of basically not being worth rebuilding by someone who isn't "in" to Supras. Once these cars make it to "less experienced" owners, a lot of corners are cut, and the cars don't last much longer. Because of the state of most 7Ms, aftermarket parts are now virtually non-existent. JZ parts are still produced and readily available, which keeps the "swapped" cars up and running, but even those can't stay around forever.
Maybe it's time for me to move on to a newer car...