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It regulates exhaust back-pressure for better engine efficiency throughout the rpm range. A certain amount of back-pressure is desireable to help keep the incoming fuel charge from being sucked out the exhaust during the overlap period between the intake and exhaust valves. As rpm's increase it opens to allow the larger amount of exhaust gasses to pass more freely.
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'05 X3 3.0i Alpine White/Gray Leather/Alum. Trim
Sport/Steptronic/Servotronic/Panoramic
Prem. Sound/Staggered 18" Style 114 Y-Spokes
Last edited by Ishniknork; 09-20-2006 at 10:05 PM.
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