Rtr
If you're running the kit as is you don't need the slipper pads , it's only when you put a hotter Motor in that this becomes an issue and then only change them when the std ones wear out.
I would also run the car for the first time as is and then change to mm4, but just get out and run it as is, the only change would be the tyres and even that's not essential for your first run. Enjoy !!
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