Description
Overview
The Flowmaster Flow FX Extreme Cat-Back Exhaust System is a stainless steel performance upgrade engineered for the 2019*-2026 (* 2019 New Body Only) Chevrolet/GMC Silverado/Sierra 1500 equipped with the 5.3L engine. Built around a Flow FX series muffler, this cat-back setup delivers an aggressive-to-moderate exhaust note while unlocking added performance and improved flow over the restrictive factory system.
Constructed from 3.00-inch mandrel-bent 409 stainless steel tubing, the Flow FX Extreme system is designed for maximum exhaust flow and long-term durability. The mandrel bends preserve pipe diameter through every turn, keeping exhaust moving freely from the muffler out through the exit. On the dyno, this system produced max gains of 15 hp and 20 lb-ft at the rear wheels.
Extreme Turndown Design
What sets this system apart is its turndown-style dump exit, positioned right after the muffler to eliminate the over-axle tailpipe. By removing that rear tailpipe, the Flow FX Extreme improves ground clearance and departure angle — a meaningful advantage when you’re navigating more extreme off-road situations. It’s the ideal exhaust for truck owners who split time between the street and the trail.
Sound & Performance
The Flow FX series muffler is tuned to deliver an aggressive sound level with a moderate character, giving your Silverado or Sierra a deeper, more purposeful tone without excessive drone. The single tailpipe configuration and 3.00-inch center-inlet, center-outlet muffler work together to boost breathing and free up power throughout the range.
Key Highlights
- 3.00-inch mandrel-bent 409 stainless steel tubing for maximum flow and durability
- Flow FX series muffler with an aggressive-to-moderate sound level
- Turndown dump exit eliminates the over-axle tailpipe for better ground clearance and departure angle
- Max dyno gains of 15 hp and 20 lb-ft at the rear wheels
- Uses factory hanger locations and includes all necessary hardware for easy installation
- CARB (California) compliant — Emission Code 5
Fitment
This cat-back system is specifically designed for the 2019*-2026 Chevrolet/GMC Silverado/Sierra 1500 with the 5.3L engine (* 2019 New Body Only). Verify your model year and body style before ordering to ensure correct fitment.
Easy Installation
Installation is straightforward thanks to the use of factory-mounting locations and included hardware. The Flow FX Extreme bolts into place using the truck’s original hangers, making it a clean, direct upgrade. Both the muffler and pipes feature a silver finish, and the muffler measures 44.00 inches overall with a center inlet and center outlet. Backed by Flowmaster’s Lifetime Limited Warranty.
