This Borla cat-back exhaust system is built for the verified 2004-2009 Mazda 3 S application listed below. Select it by exact manufacturer part number 140121 and confirm the full engine, drivetrain, body, wheelbase, factory-exhaust, and Borla application notes before ordering.Key Features Exact Borla manufacturer part number for reliable identification Purpose-built cat-back exhaust system configuration Dimensions, sound profile, exit layout, finish, and included hardware remain part-number specific Exhaust clearance, hanger alignment, sealing surfaces, and tip position must be checked during installation Fitment Years Make Model Application 2004-2009 Mazda 3 S 2005 Mazda 3 SP23 2007-2009 Mazda 3 Mazdaspeed Specifications Manufacturer Borla Manufacturer Part Number 140121 Product Type Catback Fitment Type Vehicle specific, verify the complete application What's IncludedOne new Borla product identified by manufacturer part number 140121. Clamps, hangers, gaskets, tips, pipes, tools, and companion parts are included only when expressly listed for this exact part number.About BorlaBorla develops stainless-steel exhaust systems, mufflers, tips, pipes, and related components for vehicle-specific and universal performance applications. Product selection remains exact-application and exact-part-number specific.Related Borla Products Borla 00-06 Toyota Tundra 4.7L V8 AT/MT 2WD/4WD Truck Side Exit Catback Exhaust Borla 02-07 WRX Twin Tip Hush Catback Exhaust Borla 03 Thunderbird 3.9L V8 AT RWD 2 DR Catback Exhaust Browse the Borla collection for related exhaust systems and components.Frequently Asked QuestionsWill this Borla part fit my 2004-2009 Mazda 3 S?That application is listed, but confirm the engine, drivetrain, body or cab style, wheelbase, factory exhaust layout, tip opening, and every Borla application note before ordering.Will this change require an engine tune?A cat-back, axle-back, tip, muffler, or post-catalyst component usually does not require tuning, but confirm the exact application, emissions configuration, oxygen-sensor locations, and local requirements before installation.What should I inspect before installation?Check the shipping carton and components against the exact part number, then inspect clamps, hangers, gaskets, mating flanges, clearances, tip alignment, and required reused factory hardware before removing the original exhaust.Installation InstructionsFollow the current Borla instructions and vehicle service information for this exact part number. Let the exhaust cool, support the vehicle safely, compare all parts before removal, protect sensors and wiring, use the specified clamps and torque values, align all joints and tips without preload, confirm body and suspension clearance, check for leaks, and retorque after the first heat cycles. Professional installation is recommended.
