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I installed a Custom Exhaust system, front to back on my truck. Cut out the factory Y pipe and replaced it with an X pipe, ran duals to a Flowmaster 70 series dual in dual out muffler. I used the tips from my Ford Harley Davidson truck on my Titan. It was so loud you could not hear yourself think. We reduced the tip size from 4 inch to 2.5 inch and the truck is now as quiet as factory?????I never thought that the tips made that much difference in the sound, it did on mine..
DT
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