The Flowmaster Signature Series Cat-Back Exhaust System is engineered for 2019–2026 Chevrolet Silverado and GMC Sierra 1500 (new body style) models equipped with the 5.3L engine and factory dual tailpipes. This high-end performance exhaust delivers a deep, moderately aggressive tone while maximizing airflow, durability, and horsepower gains.

Constructed from premium brushed 304 stainless steel, this system provides exceptional corrosion resistance and a clean, high-end appearance. The TIG-welded design offers increased strength, better heat control, and a precision-crafted look that complements its performance enhancements.

The system features a 3.00-inch inlet pipe feeding into a Signature Series straight-through muffler, then splits into dual 2.50-inch mandrel-bent tailpipes routed to clear the factory spare tire and tow hitch. The exhaust exits through the factory bumper bezels, maintaining an OEM dual-exit appearance.

Dyno testing shows gains of up to 21 horsepower and 26 lb-ft of torque at the rear wheels, providing noticeable improvements in throttle response and overall driving performance. Installation is simple with factory hanger locations, all necessary hardware, and included instructions.

Key Features:
• Premium brushed 304 stainless steel for maximum corrosion resistance
• TIG-welded construction for superior strength and clean weld appearance
• Straight-through Signature Series muffler for aggressive/moderate tone
• Dyno-proven gains of 21 hp / 26 lb-ft over stock
• Retains factory dual exhaust bezels for OEM appearance
• Installer-friendly bolt-on design using factory hangers
• Mandrel-bent dual 2.5-inch tailpipes for unrestricted flow
• Designed for trucks equipped with factory dual tailpipes

Specifications:
• Exhaust Type: Cat-Back
• Material: 304 Stainless Steel
• Sound Level: Aggressive / Moderate
• Inlet Diameter: 3.00 in
• Tailpipe Diameter: 2.50 in (each)
• Muffler Type: Absorption
• Muffler Body: 18" L × 9" W × 4" H (Oval)
• Finish: Natural brushed stainless steel
• Exit Style: Dual Rear Exit (factory bumper bezels)
• Hangers Included: Yes
• Clamps Included: Yes
• Valve: Not Applicable

Fitment 

Compatible Vehicles (New Body Style):
• 2019 Chevrolet Silverado 1500 5.3L with factory dual tailpipes
• 2020 Chevrolet Silverado 1500 5.3L with factory dual tailpipes
• 2021 Chevrolet Silverado 1500 5.3L with factory dual tailpipes
• 2022 Chevrolet Silverado 1500 5.3L with factory dual tailpipes
• 2023 Chevrolet Silverado 1500 5.3L with factory dual tailpipes
• 2024 Chevrolet Silverado 1500 5.3L with factory dual tailpipes
• 2025 Chevrolet Silverado 1500 5.3L with factory dual tailpipes
• 2026 Chevrolet Silverado 1500 5.3L with factory dual tailpipes

• 2019 GMC Sierra 1500 5.3L with factory dual tailpipes
• 2020 GMC Sierra 1500 5.3L with factory dual tailpipes
• 2021 GMC Sierra 1500 5.3L with factory dual tailpipes
• 2022 GMC Sierra 1500 5.3L with factory dual tailpipes
• 2023 GMC Sierra 1500 5.3L with factory dual tailpipes
• 2024 GMC Sierra 1500 5.3L with factory dual tailpipes
• 2025 GMC Sierra 1500 5.3L with factory dual tailpipes
• 2026 GMC Sierra 1500 5.3L with factory dual tailpipes

Notes:
• Fits both 2WD and 4WD models
• For trucks equipped with factory dual exhaust / dual bumper bezels
• New Body Style models only