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To some 50k can be a life time.
Last set of pistons I had made were from mahle, the chap I dealt with was a lancia enthusiast and when I talked about what I wanted, he went off and we spent ages discussing materials and specs. What I paid for 40 pistons, ring and gudgeon pins, 10 sets of four, I believe was cheaper than they should have been. The mahle guys are helping me still. Lots of video chats and calls to people who really know there stuff and really helped me go for my dream.
It’s a subset of a subset (of a subset, possibly), basically people who could buy a GT3 but decide to build their own version