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I ran into a guy at Nissan dealer getting his Titan serviced. It sounded really good. He told me all he did was goto a muffler shop and replace the muffler to a Magnaflow. That's it.

He feels no difference in power or gas mileage. He only wanted to get a meaner and deeper big block sound.

The muffler shop guy said that the stock exhaust system is among the best he's seen and that a new cat back system is overkill.

What you you all think? Are the Bank, Borla, Gibson cat backs a larger diameter system? If not, can it really make a noticeable difference?
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