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    Magnaflow 12589, 12909 or 12578

    I think I have read all the threads regarding mufflers/exhausts and it seems most who choose Magnaflow went with 12589 and a few went with 12909. I have a 2008 Yukon Denali XL. Looking under the car, I noticed the stock muffler is offset/offset (and the plumbing is 3.5" diameter). I'm sure my...
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