How far can we push drift engines BEFORE they blow up?

in this video we chat with ‪@RKTUNES‬ about pushing our BMW drift engines, but this probably is a viable listen for all engines. He has lots of experience with tuning tons of different NA and turbo engines, and I am always so curious how far we can push things safely, but not deal with the failures. I just want to drift, not work on drift cars. It doesn't matter if you have a 350Z, AE86, GR86, Nissan Z, E46, this all pertains.