the knock sensor is the main reason for that in hyundai's. if the car isen't knocking at the red line the car will continue to rev but like cottonmouth said your engine isen't making any power up there and all you are doing is hurting your valvetrain.
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2001 F150 Super Crew - The deer slayer
2006 Ford Freestyle - Wifes daily driver
2003 Tiburon GT - SCCA STX and still daily driven
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