Age old question stretching back as far as I can remember. Unless the metal is extremely thin, like cheap aftermarket or rusted badly, and/or the lifting force is focused on a very narrow area, you should be okay. I don't know that I've ever heard of anybody damaging a pipe being careful and with the lifting force spread out. I
Still, I always look for an alternative - like the 2x4 between the pipes and the motor - but sometimes there's no alternative.