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exhaust groan

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Old Aug 27, 2002 | 02:58 PM
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bada bing's Avatar
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From: Green Bay
exhaust groan

I have a 2002 F150 with the 5.4L. I just installed a Ravin Z33 SI/DO Muffler and I am getting a groaning humm that resonates through the cab from about 1100 rpm to 2000 rpm. Does anyone else with Ravin mufflers have this problem? Also, is anyone with the Z55 series experiencing this?
 
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