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Description
MagnaFlow Sys C/B 05-09 Ford Mustang 4.6L V8 3inchThe MagnaFlow 2005 2009 Ford Mustang Competition Series Cat Back Performance Exhaust System 16674 brings an aggressive, attention grabbing edge to the deep resonant exhaust note we're so well known for. This exhaust kit is designed to enhance your 4. 6L, 5. 4L 2005 2009 Ford Mustang with dyno proven performance made possible thanks to fast flowing mandrel bent 3in. main piping and 2 Straight Through mufflers ending in a Dual Split Rear exit with 4in.
The MagnaFlow 2005-2009 Ford Mustang Competition Series Cat-Back Performance Exhaust System 16674 brings an aggressive, attention-grabbing edge to the deep resonant exhaust note we're so well known for. This exhaust kit is designed to enhance your 4.6L, 5.4L 2005-2009 Ford Mustang with dyno-proven performance made possible thanks to fast-flowing mandrel bent 3in. main piping and 2 Straight-Through mufflers ending in a Dual Split Rear exit with 4in. Polished Welded-On Double Wall Angle Cut Folded Edge tips featuring a sporty finish. The exhaust system's cat-back layout replaces your ride's exhaust system from near the catalytic converter on back. Exhaust system 16674 is engineered to make your vehicle's engine produce Aggressive exterior and Moderate interior sound levels, befitting its competition-oriented design. 16674's direct-fit design makes installation a breeze thanks to the use of advanced 3D scanning techniques. This performance exhaust system is made of 100% durable and corrosion-resistant stainless steel and produced using CNC precision robotic manufacturing, all backed by MagnaFlow's limited lifetime warranty. Please check to ensure compliance with local noise regulations.Installation Instructions
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Exchange/Return Notes
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4.4 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 2
Decent, but be careful of frequent use.
Size: 12 Pairs / 24 pcs, Size: 12 Pairs / 24 pcs
The looks are very nice, functional if left alone once assembled. After that I would leave them alone otherwise you risk the main male portion just coming loose of the housing, sound quality is decent, nothing to write home about, but again, not very durable. If they could fix that 1 thing, these would be very good buy and value, the rest of each plug is hefty and well made.
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Reviewed in the United States on January 12, 2026
★★★★★ 5
Fixed my over temp warning issue.
Easy to change and work like new. No more over temp warning at idle.
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Reviewed in the United States on June 9, 2025
★★★★★ 5
Outboard thermostat
Works fine. A little pricey but better to buy the best than risk a cheap failure and destroy your engine like i did once.
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Reviewed in the United States on May 29, 2026
★★★★★ 5
Good
Good
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Reviewed in the United States on April 27, 2026
★★★★★ 5
Works as it should
Works as it should
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Reviewed in the United States on March 24, 2026