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socal,
The magnaflow has an internal crossover which eliminates need for x or h pipe. If you went flowmaster dual in/dual out then yes, you would more then likely need a x pipe. I am very pleased with the performance AND sound. At highway cruising speed with stereo off, you can barely make out a slight rumble. But at all speeds, get on the gas and she talks!! I have not encountered any ear ringing/ head vibrating drone and its been on there about 3 weeks or so now so I think it would have surfaced by now.
Let me know if you need anyting else, more then happy to help.
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