I never had that with the magnaflow I had on my G, or the Injen I had on my GSX, which is why it seemed new to me. I know exhausts will make a pinging sound when they cool, but this one thuds more than pings ya know?
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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs
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