+1 on the underdrive pulley.
The one I bought from Flat6 fitted perfectly and you can feel the difference in the low to medium rev range where 90% of your driving is....
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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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