2011 F150 XLT 5.0 Dual Exhaust
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The muffler does have an internal x pipe. after going to the exhaust shop they said the can't modify my factory exhaust before the y pipe to run duals. i called the local ford service center for clarification and they told me if i modify the y pipe it will void my warranty. I reordered my muffler for a 3 in single inlet dual 2.5 in outlets, should be in by tuesday next week. Side note: only reason i am ordering a muffler is because the exhaust shops in hawaii only seem to carry flowmaster, dynomax or borla and I wanted a magnaflow muffler. I will post videos as soon as I can get it done
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