VIDEO: New FlowFX Exhaust Systems for ’99-’07 Chevy Silverado & GMC Sierra

Just when you think you’ve heard (literally) just about every form of Flowmaster exhaust system out there, those guys in Kentucky pull the cover off of a brand new design. Namely, the Flow FX series that’s quickly making its way though the industry. Just very recently, the’ve announced the Flow FX system for the 1999-2007 Chevy Silverado and GMC Sierra trucks.

Although these vehicles are now 15-20 years old, there’s still plenty of them on the road and there’s definitely still an interest in unleashing additional power and increasing the sound level. In fact, they’ve reached bargain basement pricing, and it’s never been easier to get your hands on a GMT800 pickup. So check out the sound clip above, and get the details on the latest kit from Flowmaster below!

Official Release:

New FlowFX Exhaust Systems for ’99-’07 Chevy Silverado & GMC Sierra

Flowmaster is pleased to release their latest FlowFX cat-back exhaust system for 1999-2007 Classic Body GM Silverado/Sierra 1500 trucks with 4.3L, 4.8L and 5.3L engines. These systems enhance looks, performance, and sound alike. Featuring 409SS construction and 16-gauge mandrel-bent tubing, these FlowFX systems boast improved durability and unrestricted flow over stock. As a result of the system design, the installation of this kit yielded 6.7 horsepower and 6.5 ft/lbs or torque on our development vehicle.

The compact, oval “straight-through” FlowFX performance muffler attaches behind the catalytic converter and delivers a moderate, deep and powerful sound with minimal interior resonance. The mandrel-bent stainless tailpipe tucks up high in the undercarriage protecting it from being crushed when traversing rocky terrain.

The system fits extended cab 6.5’ bed trucks as well as the crew-cab trucks with 5.5’ beds that feature a 143.5’’ wheelbase.

Factory hanger locations are utilized and the system is finished off with a 4.5-inch black ceramic-coated 304SS tip embossed with the Flowmaster name. The kit includes detailed instructions and all hardware necessary for a quick and easy installation you can do at home. It is also supported by Flowmaster’s Lifetime Limited Warranty.


  • Finished off with a 4.5″ black ceramic-coated 304SS tip
  • Increase horsepower and torque levels
  • Improves performance
  • Awesome soundtrack
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