[mitch808]

Yes, higher boost, often means a slightly closer/smaller gap. Assuming you're tuned for high boost. It also means usually a step colder plug too. These are preventative steps, not power adders.

If stock, just changing them more often than the normal 100k interval, could mean easier starting, smoother idle, and smoother acceleration. Doing it at 30k-50k is not terrible IMO. 100k seems way too long IMHO. yeah, BMW says it'll last, but again, there are benefits to fresh plugs.

You don't touch the coldness, maybe you could gap a few hundredths smaller, but it's not necessary.