Out of stock
SKU: FLO817981
UPC: 090127130575
MPN: 817981
The Cat Back Exhaust System 21- Ford F150 3.5/5.0L by FLOWMASTER delivers measurable performance gains and refined engine tone for modern F-150 owners seeking improved throttle response and fuel efficiency. Cat-back exhaust systems replace the factory piping downstream of the catalytic converter, preserving emissions compliance while unlocking horsepower typically suppressed by restrictive OEM silencers. This configuration is ideal for truck enthusiasts who want bolt-on performance without custom fabrication or tune requirements—making it the go-to upgrade for daily drivers and weekend haulers alike.
FLOWMASTER's engineering focuses on mandrel-bent tubing and high-flow muffler technology designed to minimize backpressure while maintaining structural integrity under sustained towing loads. The stainless-steel construction resists corrosion in harsh climates and salt environments, critical for truck longevity. Dual outlet design enhances visual stance while promoting balanced exhaust scavenging across both cylinder banks—whether running the 3.5L EcoBoost or the naturally aspirated 5.0L V8. Precision-engineered exit velocity improves cold-start warmup and reduces turbo lag on the EcoBoost variant, translating to snappier acceleration and smoother power delivery across RPM ranges.
Compatibility spans 2021 and newer Ford F-150 models equipped with either the 3.5L twin-turbocharged EcoBoost or 5.0L naturally aspirated engine—verified against factory suspension geometry and undercarriage clearance. Installation typically requires basic hand tools and a lift or jack stands; professional installation is recommended to ensure proper hanger alignment and prevent resonance. The 73.3 lb system ships as a complete assembly, eliminating guesswork and guaranteeing fitment precision that aftermarket fabrication cannot match. Real-world owners report 8–12 hp gains, improved engine note without excessive drone at highway speeds, and noticeable throttle response improvement within the first 500 miles of break-in.
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