Fits 2020-2026 GM Silverado/Sierra 2500HD/3500HD 6.6L Gas V8, Outlaw Series, 3.50" to Dual 3.00" Cat-Back, Dual Rear Exit, Stainless Steel Exhaust System
Questions about fitment? Live chat or call 866-235-4715
Couldn't load pickup availability
- Free shippingMost orders $500+
- 30-day returnsSee policy
- Warranty supportWe work with the maker
Questions about fitment?
Talk to a TRU specialist
We’ll help you verify fitment before you buy.
Veteran-owned · Austin, Texas · Mon–Fri 9:30a–11:00a & 1:00p–5:30p CT
Important notes before you order
- Fits Crew Cab with 6.5-foot bed length, 159-inch wheelbase only.Will not fit models with GM Factory puck system or 5th wheel tow hitch installed.
Specifications
| Brand | Flowmaster |
|---|---|
| Part number | 818112 |
| Brand | Flowmaster |
| CARB (California) Compliant | Yes |
| Catalytic Converter Included | No |
| Catalytic Converter Quantity | 0 |
| Category | Exhaust |
| Clamping Type | Flat Band |
| Clamps Included | Yes |
| Emission Code | 5 |
| Exhaust Series | Outlaw |
| Exhaust Tip Color | Silver |
| Exhaust Tip Connection | Clamp-On |
| Exhaust Tip Cut | Angled |
| Exhaust Tip Diameter | 4.00 IN |
| Exhaust Tip Edge | Angle Cut |
| Exhaust Tip Finish | Polished |
| Exhaust Tip Intercooled | No |
| Exhaust Tip Length | 13.00 IN |
| Exhaust Tip Material | 304 Stainless Steel |
| Exhaust Tip Quantity | 2 |
| Exhaust Tip Resonated | No |
| Exhaust Tip Shape | Round |
| Exhaust Tip Wall | Double Wall |
| Exit Style | Dual Out Side |
| Finish | Natural |
| Gasket Or Seal Included | No |
| Grade Type | Performance |
| Hangers Included | Yes |
| Inlet Diameter | 3.50 IN |
| Inlet Type | Flanged |
| Main Piping Diameter | 3.00 IN |
| Mount Type | Uses Factory Hangers |
| Mounting Bracket Included | Yes |
| Muffler Body Height | 4.00 IN |
| Muffler Body Length | 6.50 IN |
| Muffler Body Material | 409 Stainless Steel |
| Muffler Body Shape | Oval |
| Muffler Body Width | 9.50 IN |
| Muffler Color | Black |
| Muffler Finish | Black High-Temperature Paint Finish |
| Muffler Flanged Inlet | No |
| Muffler Flanged Outlet | No |
| Muffler Included | Yes |
| Muffler Inlet Connection | Slip-Fit |
| Muffler Inlet Inside Diameter | 3.50 IN |
| Muffler Inlet Location | Center |
| Muffler Inlet Outside Diameter | 3.63 IN |
| Muffler Outlet Connection | Slip-Fit |
| Muffler Outlet Diameter | 3.00 IN |
| Muffler Outlet Location | Dual |
| Muffler Outlet Quantity | 2 |
| Muffler Overall Length | 12.375 IN |
| Muffler Part Number | Kit Only |
| Muffler Quantity | 1 |
| Muffler Series | 10 Series |
| Muffler Type | Chambered |
| part type | Exhaust System |
| Pipe Color | Silver |
| Pipe Material | 409 Stainless Steel |
| Product Type | Exhaust System |
| Sound Level | Aggressive |
| Spring Bolt Kit Included | No |
| Sub Category | Exhaust and Tail Pipes |
| Tail Pipe Outlet Outside Diameter | 3.00 IN |
| Tail Pipe Quantity | 2 |
| Tail Pipe Tapered Outlet | No |
| Tip Logo | Embossed |
| Type | Cat-Back |
| Valve Included | No |
| Valve Type | Not Applicable |
| Warning | California Proposition 65 |
California Proposition 65 warning applies to this product. www.P65Warnings.ca.gov
Features
- Can be configured to exit straight out the rear or out the side depending on preference
Installation
Free install support from the Trucks R Us tech team, for you or your shop.
Overview
This Flowmaster® Outlaw® Cat-back exhaust system for the 2020-2026 Chevy Silverado and GMC Sierra 2500HD/3500HD trucks with the 6.6L gas engine, is perfect if you are looking for an aggressive sound level inside and outside of the truck, with all of the performance benefits that you would expect from Flowmaster®. Maximum increases of up to 9 hp and 9 lb.ft. over the stock exhaust at the rear wheels. Designed for the Crew Cab, Standard Bed (6.5 ft.) models only, this bolt-on, emissions-legal system features a stainless steel Outlaw series muffler and large dual 3.00-inch 409 stainless steel mandrel-bent tailpipes that can be configured to exit either dual straight out the back, or dual out the sides behind the rear wheels which is best suited for towing applications. The system is finished off with polished 4.00-inch stainless steel tips and is covered by our Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.
Questions
Will this fit my truck?
Select your truck at the top of the page and the fit check will confirm it. If your exact trim is not listed, call 866-235-4715 or live chat and a fitment specialist will check it before you order.
Do you help with installation?
Yes. Our technical team helps you or your shop with installation and troubleshooting after delivery, on top of the manufacturer’s support.
What if the part has a problem?
We work the warranty claim with the manufacturer on your behalf, within the manufacturer’s warranty policy.
Can I return it?
Most items can be returned within 30 days. See our return policy for details.
No reviews for this part yet. Trucks R Us is rated on Trustpilot, Google and the BBB.
About Flowmaster
Manufacturer of performance exhaust systems, mufflers, performance air intakes, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices... Shop all Flowmaster