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Pup.
They were first developed with the purpose/idea to simply slow down the accessories (power steering pump, alternator, AC compressor) on a car that spends a lot of time running high revs. 986/987 PS pumps are known to overheat and leak under heavy track use.
A side benefit is that the underdrive pulley reduces parasitic drag from these components and you can measure an increase in hp and torque at all rpms between 5-10 rwhp depending on the model.
Don't have one myself (yet) but only heard good things!
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Don't care......was made to care! (my Mum)
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