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the benefits come from reducing the power that is taken away from the crank by accessories such as power steering, alternator, etc, since the load is lightened or the pulley is sized for optimal power the crank is not robbed of other power. Not typically a big difference, but does look good as well for dressing the engine up.

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You can drop a few kilos off the weight of the pulleys if made from alloy. The under driven pulleys reduce some accessory horsepower drain and importantly reduce high rpm water pump cavitation above 7,000rpm.

Dropping as much as 4 kilo's off the front pulley rotational mass will give a gain similar to lightening the car 200kgs in the first gear. This is the same priciple for the flywheel.

The difference is large enough on a road car, good for spooling the turbo faster ,as the engine will rev quicker due to reduced inertia.

An excellent mod, overlook it if your a 'bolt on' boy, or if the engine harmonics don't agree. The RB25det ought to be fine.

I'd say the trust pulleys could be 'made' to fit.

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