Description
Overview
The Flowmaster Flow FX Cat-Back Exhaust System is engineered to give your 2009-2013 GM Silverado/Sierra 1500 with the 5.3L engine a deeper, more aggressive voice and a genuine performance upgrade over the restrictive factory system. Built around Flowmaster’s proven Flow FX “straight-through” muffler technology, this complete cat-back kit balances a bold exhaust note with real-world drivability, delivering moderate-to-aggressive sound without droning out your daily drive.
Every component is manufactured from durable 409 stainless steel throughout, so the system stands up to heat, road spray, and years of use. A 3.00-inch inlet pipe feeds the single-inlet, dual-outlet Flow FX muffler, which uses a center inlet and dual outlet design to maximize flow and unlock the horsepower and throaty tone truck owners want.
Key Benefits
The dual 2.50-inch mandrel-bent tailpipes exit out the side at an angle behind the rear wheels. That routing isn’t just for looks — it directs exhaust away from your boat or travel trailer when towing, keeping fumes clear of the gear behind you. The system is finished with a pair of large 4.50-inch diameter black ceramic-coated 304S stainless steel tips featuring an embossed logo, giving your truck a custom, purposeful appearance that matches the deep Flow FX sound.
- Durable 409 stainless steel construction throughout for long service life
- 3.00-inch inlet pipe into a single-inlet/dual-outlet Flow FX straight-through muffler (24.00-inch overall length)
- Dual 2.50-inch mandrel-bent tailpipes with side exit behind the rear wheels for cleaner towing
- Large 4.50-inch black ceramic-coated 304S stainless steel tips with embossed logo
- Aggressive/moderate sound level tuned for performance and everyday comfort
- CARB (California) compliant — Emission Code 5
Easy Bolt-On Installation
This system is designed for a straightforward at-home install. It uses all the existing factory hanger locations and includes an additional hanger to mount the new left-side tailpipe. Installation instructions and all necessary hardware are included, so you have what you need to complete the job without cutting or welding. The muffler and dual silver tailpipes come as part of the complete kit.
Fitment
Engineered specifically for 2009-2013 GM Silverado 1500 and Sierra 1500 trucks equipped with the 5.3L engine. Fits both 2wd and 4wd models with 143.5-inch and 157.5-inch wheelbases only. Because it retains the factory hanger points, the Flow FX cat-back drops into place using the truck’s original mounting design for a clean, OE-style fit.
Warning: This product carries a California Proposition 65 warning.
