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Removing and fitting the box twice would be the costly bit. Better to buy a 2nd box and have the diff built into that. Then you can keep the car on the road and do one swap once the diff is in. Looking at £200 to remove and fit a box.
Yeah that's cold road pressures i was quoting.
I try to run my AD08's around that at their hot pressure though on track.
Yokohama and Toyo both say around 28-34psi hot for a ~1000kg car.
End of Jan 2013 it was yeah. It's still going well, got a few bits to refresh on it and it's having a diff put in soon.
I remember you getting the 123d, I gave it a once over with the DA polisher.
Surprising that, it's always worked for me.
Carbide or a regular HSS bit should drill it out, I'd say go with a slow speed to avoid ruining the drill bit.