Just do PRND. S, and indeed 432, are simply software and have no impact on the mechanical stuff in the gearbox. It won't change in tip when stationary anyway.
Installing that cat is a really hateful job. I use a piece of thin card with three holes punched in it to hold the three bolts straight, then once the downpipe is in place and the nuts started the card can be torn out of the gap.
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