Well I'm just pulling this one out of my bum, but you probably won't need to resleeve for extra strength unless your going... over 10k? Does that sound right? Good R/S and walls on the B16 help, but I think it may cause premature wear on the engine
I would like to know this one myself as well, maybe someone can fill us in?
But I would think you need extra cooling for a high reving engine as well.