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I have a bunch of USB-C power supplies (some at different wattages).

Would my Mac charge faster (or blow up) if I plug two power supplies into the same computer (different USB-C slots)

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No.

Your MacBook will charge from the one which provides higher power. Quoting from the Apple support document, Connect with Thunderbolt 3 on your new MacBook Pro:

Notes on charging your MacBook Pro:

  • Your MacBook Pro draws power from only one power supply, even if more than one is attached—so using multiple power supplies won't speed up charging.

  • If you connect multiple power supplies to your MacBook Pro, the one that provides the most power will be used, regardless of the order in which you connected them.

  • You shouldn't connect any power supply that exceeds 100W, as it might damage your MacBook Pro. Also, using a power supply that doesn't provide sufficient power can result in slow or delayed charging. It's best to use the power supply that came with your Mac.

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  • Don't do it. I unintentionally connected two Apple chargers into 2 MacBook Pro's and BOTH ended up failing. Apple might tell you it is supported but YOU will end up paying $795 each time you try it and it fails.
    – Rori Stumpf
    May 3, 2019 at 14:53
  • @RoriStumpf Kindly share this comment on the question instead of this answer so that the author of the question gets notified. Once done, please delete it from here.
    – Nimesh Neema ♦
    May 3, 2019 at 14:57

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