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Benefits of upgrading the exhaust system: More horsepower Free up torque Improve upon restrictive factory systems Lower auto exhaust backpressure Much better sound. Compatible with: 2002-2006 Nissan Altima Base 2.5L 2002-2006 Nissan Altima S 2.5L 2002-2006 Nissan Altima SL 2.5L 2003 Nissan Sentra Limited Edition 2.5L 2004 Nissan Sentra S 2.5L 2002-2006 Nissan Sentra SE-R 2.5L 2002-2005 Nissan Sentra SE-R Spec V 2.5L Please kindly use Amazon Part Finder to make sure fitment. Note: Illegal for use on vehicles required to meet California emission standards Cutting and welding may require, professional installation is highly recommended.