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I don't think you can save 10-15HP. My understanding is that the alternator, power steering pump, water pump, and air conditioning condenser only consume a few HP each.

If you were to cut the belts and remove them completely, you could save 10-15HP. However, overdrive pulleys only increase the pulley diameter by 10-20% which may net you 2-3HP.

Then you have other complications (mentioned by others) and you will either need longer belts or will be running the tensioners under higher tension which will likely cause premature bearing failure or at least squealing noise (sooner than later).

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