Cat-Back Exhaust Kit - 04-08 F150 4.2/4.6/5.4L

The Cat-Back Exhaust Kit for 04-08 F150 with 4.2L, 4.6L, or 5.4L engines from Flowmaster is designed for truck owners looking to enhance exhaust flow and improve power delivery while maintaining street legality. This system effectively replaces the restrictive factory exhaust components downstream of the catalytic converter, allowing for increased horsepower and torque. Whether for towing, daily driving, or a more responsive throttle, this cat-back system provides noticeable performance improvements.

Flowmaster has engineered this kit with mandrel-bent tubing to ensure a consistent diameter, eliminating flow restrictions often found in factory components. The design retains the factory catalytic converter, which is essential for legal street use and maintaining fuel trim stability. Additionally, the optimized muffler and resonator configuration balances scavenging efficiency with controlled noise levels, enhancing the overall driving experience.

This cat-back exhaust kit is perfect for F150 owners with naturally aspirated 4.2L, 4.6L, or 5.4L Triton engines from the 2004–2008 generation who desire a straightforward bolt-on performance upgrade without the need for tuning or modifications. Installation is designed to be user-friendly, taking approximately 2–4 hours with basic hand tools. The durable stainless steel construction ensures resistance to corrosion and thermal degradation, making it suitable for tough truck environments.