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If the Infiniti QX4 Exhaust Manifold has cracked, we have the Infiniti OE replacement Exhaust Manifold's at discount prices. We recommend changing all the exhaust studs on the QX4 when replacing the manifold.
If your Infiniti QX4 muffler is worn out, use only OEM quality replacement mufflers. DriveWire carries hundreds of high quality Infiniti QX4 mufflers that carry a lifetime warranty.