You will be ordering your plain TRF for 435$ + import cost + douane cost. You will add at least 140$ and you have O spares.
To have a competitive TRF501x you need the improved drivetrain, ceramic diff balls, front one way, another screw set (titanium is the best), other ball studs and ball cups.
Do a search and you will understand what I'm saying.
Believe it or not but when you race a car you will need lots of spares (almost a second car) to keep your car going.
Ciao
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