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It is very hard to zing a motor or tranny in SRF. Not saying it's impossible but if you did the units were most likely weak and ready to break down. It is not uncommon to get quite a number of years on an SRF engine and transmission before a rebuild is necessary, and still be competitive in the class. SRF is in my opinion and experience, the best class ever conceived for low budget racing. In SM some cars are more "spec" than others if you know what I mean and therefore the costs can vary significantly from car to car.