I did, but if I deem it necessary, I could put it back together again. [he just doesn't want anyone else to have access...]

For my experiment, it was my choice to modify my lungs based on preliminary research to see if it was ready for all Reliver models. However, the pain is an unexpected side effect even though my lungs are strengthened.

[they're stronger and he can endure more than the average person, but also every breath is absurdly painful so it's also unsustainable for the average person]