Flowmaster
Flowmaster 818112 Outlaw Cat-Back Exhaust 3.5 to 3 Inch Dual Rear Exit Stainless 4 Inch Polished Tips Compatible with 2020-2024 Chevy Silverado GMC Sierra 2500HD/3500HD Crew Cab 6.5' Bed 6.6L Gas V8
Flowmaster 818112 Outlaw Cat-Back Exhaust 3.5 to 3 Inch Dual Rear Exit Stainless 4 Inch Polished Tips Compatible with 2020-2024 Chevy Silverado GMC Sierra 2500HD/3500HD Crew Cab 6.5' Bed 6.6L Gas V8
SKU:F13818112
In stock
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- Genuine brand-name parts
- Ships from US warehouse
- 30-day returns
The Flowmaster 818112 is an outlaw cat-back exhaust 3.5 to 3 inch dual rear for 2020–2024 Chevrolet Silverado 1500, 2020–2024 GMC Sierra 1500. It is a new, genuine Flowmaster part with the manufacturer warranty, shipped from the closest US warehouse.
Fits: 2020–2024 Chevrolet Silverado 1500 · 2020–2024 GMC Sierra 1500
Key features
- Max increases of up to 9 hp and 9 lb.ft. over the stock exhaust at the rear wheels
- 3.50-inch and 3.00-inch mandrel bent 16-gauge 409 stainless steel tubing maximizes exhaust flow and improves durability
- Dual 4.00-inch polished stainless steel tips add a custom look
- Includes complete hardware and factory styled hangers in the stock locations for an easy installation
- Super 10 Series performance muffler delivers a deep, aggressive performance tone and improves exhaust flow
- Backed by Flowmaster’s Lifetime Limited Warranty
- Can be configured to exit straight out the rear or out the side depending on preference
Specifications
| Brand | Flowmaster |
|---|---|
| Manufacturer part number | 818112 |
| Part type | Muffler |
| UPC / GTIN | 90127130162 |
| Vehicle fitment | 2020–2024 Chevrolet Silverado 1500 · 2020–2024 GMC Sierra 1500 |
| Weight | 51.00 lb |
| Dimensions (L × W × H) | 29.1 × 23.1 × 22.6 in |
| Category | Engine & Drivetrain |
| Condition | New — genuine brand-name part |
| Warranty | Manufacturer warranty |
Questions
Will this fit my vehicle?
It is listed for 2020–2024 Chevrolet Silverado 1500, 2020–2024 GMC Sierra 1500. Trim, engine and options can change the part a vehicle needs — send us your VIN and we will confirm before you order.
How fast does it ship?
Orders ship from the closest US warehouse, normally within 1–3 business days, with tracking by e-mail.
Is this a genuine Flowmaster part?
Yes — new and genuine Flowmaster, with the manufacturer warranty.
Can I return it?
Yes. Unused items can be returned within 30 days — see our refund policy for the details.
Shipping & delivery
Shipping & delivery
Orders ship from the distributor warehouse closest to you, normally within 1–3 business days of purchase. Standard ground delivery takes 3–7 business days in the continental US; expedited options are shown at checkout. Oversized items (bumpers, running boards, large tonneau covers, some marine equipment) ship LTL freight — we contact you to schedule delivery and a signature is required.
Returns & warranty
Returns & warranty
Unused, uninstalled parts in original packaging can be returned within 30 days of delivery. A restocking fee of up to 20% may apply depending on the product and supplier, and return shipping is the buyer’s responsibility unless the item arrived defective, damaged or incorrect. Every product carries the full manufacturer warranty. Contact us with your order number to start a return.
Fitment & part numbers
Fitment & part numbers
Verify fitment with the manufacturer part number shown above and your vehicle’s year, make, model and trim. If the listing says “Fits select…”, confirm your exact application before ordering. Not sure? Send us your VIN and the part number and we’ll check it for you.
