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replaced rusted muffler

  1. Replaced Muffler with Pipe now car shakes while driving

    9-5 Workshop
    I just replaced my rusted muffler with a straight pipe. I left the resonator and cat. Now when I drive the car shakes pretty noticeably almost like the wheels are really out of balance. What could be the reason? The only thing I could think of is that the very last pipe is 2 1/8" and the stock...
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