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A faulty MAF can also cause a reduction in performance above 4000 rpm too. When I bought my Durametric I found a fault code for the MAF (no CEL displayed). The MAF was replaced and the mid range torque & power was back again.....
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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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