{"product_id":"cat-back-exhaust-for-nissan-altima-2002-2006-2-5l","title":"Cat Back Exhaust for Nissan Altima (2002-2006) 2.5L","description":"\u003ch2\u003eHigh-Flow Cat Back Exhaust for 2002-2006 Nissan Altima\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Cat Back Exhaust System replaces the restrictive factory exhaust assembly on the 2002-2006 Nissan Altima to reduce exhaust backpressure, improve scavenging velocity, and provide a deeper acoustic profile.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Nissan Altima Exhaust Restriction\u003c\/h3\u003e\n\u003cp\u003eThe factory exhaust on the third-generation \u003cstrong\u003eL31\u003c\/strong\u003e chassis utilizes narrow, press-bent aluminized steel tubing riddled with restrictive internal diameter reductions. Combined with a multi-chamber baffled OEM muffler, this configuration creates significant backpressure and thermal retention. Over time, road salt and continuous thermal cycling degrade the factory carbon-steel seams and flanges on the \u003cstrong\u003eQR25DE\u003c\/strong\u003e platform, leading to exhaust leaks and sluggish throttle response.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as a direct bolt-on upgrade, this system is fabricated with mandrel-bent stainless steel piping to preserve uniform cross-sectional diameter through every bend radius. By eliminating internal turbulence and restrictive factory baffling, it accelerates gas velocity directly downstream of the catalytic converter. Robust TIG\/MIG-welded OE-style hangers and pre-aligned flanges mount straight to factory isolation points, eliminating cutting or custom fabrication while offering superior corrosion resistance under high thermal loads.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2002-2006 Nissan Altima\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003eQR25DE\u003c\/strong\u003e (2.5L) \/ \u003cstrong\u003eL31\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e175 hp \/ 180 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eSPT-NA02L4-OV-BT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2002-2006 Nissan Altima Base 2.5L L4 (QR25DE \/ L31)\u003c\/li\u003e\n  \u003cli\u003e2002-2006 Nissan Altima S 2.5L L4 (QR25DE \/ L31)\u003c\/li\u003e\n  \u003cli\u003e2002-2006 Nissan Altima SL 2.5L L4 (QR25DE \/ L31)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the L31 Altima?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2002-2006 Nissan Altima equipped with the \u003cstrong\u003eQR25DE\u003c\/strong\u003e 2.5L inline-four engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill installing this cat-back throw a Check Engine Light (CEL)?\u003c\/strong\u003e\u003cbr\u003e No, this assembly bolts directly downstream of all factory catalytic converters and secondary O2 sensors, maintaining complete emissions compliance without triggering diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Nissan Performance Caliber\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically to unleash the operational efficiency of the \u003cstrong\u003eQR25DE\u003c\/strong\u003e powertrain, this system balances unrestricted flow dynamics with an aggressive, clean exhaust note tailored to the sport-sedan platform.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50607841083640,"sku":"DS-EOCJLFGX1","price":252.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/cat-back-exhaust-for-nissan-altima-2002-2006-2-5l-1.jpg?v=1790091560","url":"https:\/\/performancechiptuning.com\/es\/products\/cat-back-exhaust-for-nissan-altima-2002-2006-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}