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Yes, Yes & Yes...
Yes you need a different length belt - usually from the underdrive pulley supplier.
Yes a novice can do it if you have a new bolt, Loctite and a good torque wrench.
Yes you can feel the difference but only at low to medium engine speeds. They say about 5 HP max.
Two points of reference: A) don't buy a cheap pulley with large "open" section & thin arms - they break, and B) you lose the engine TDC timing hole drilled in the original solid pulley.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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