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I have just installed a Magnaflow catback on my car and it came with a resonated x-pipe muffler to replace the factory resonator. I have tsp headers and hi flow cats also. THe mf part number was 15089. It’s not loud at all. When I purchased the car it luckily came with a Magnaflow muffler delete so I just took the muffler delete pipes and tips and replaced the rear mufflers. Making it a 15090 basically. It sounds perfect to me now. If I ever get tired me of it I can easily go back If you purchased a catback it should have come with resonator replacement. Maybe op only has a axle back.
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