not too noisy

I had to go through the same deal. I finally found some nice quiet ,with a bit of a rumble. I believe they are Walker quite flow. I may still have the boxes out in the garage. If so I'll verify that, and send pics. Got at O'Reilly's had to order but had them the next day.
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Basically the same as the Flowmaster, just a little longer, at 16inches on the Walkers
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