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Vehicle Info NeededFLOWMASTERPART NUMBER: 389-818113
818113 American Thunder Cat-Back Exhaust System; Fits Select Chevrolet/GMC; Silverado/Sierra 2.7-Liter, Cat-Back
$74295
Ships on Sep 14, 2026
Lowest Price GuaranteeAmerican Thunder Cat-Back Exhaust SystemFits Select Chevrolet/GMC; Silverado/Sierra 2.7-Liter, Cat-Back, Dual Out Rear/Side Exit, Stainless Steel Sold Individually
Flowmaster 389-818113 Features:
This Flowmaster® American Thunder® cat-back exhaust system for the 2019-2024 Chevrolet/GMC Silverado/Sierra with the 2.7-liter engine is manufactured using durable 409 stainless steel throughout and features dual 2.50-inch mandrel bent pipes for better exhaust gas flow, and an American Thunder muffler is used for a moderate sound level and maximum performance. Gain up to 4 hp and 11 lbs-ft of torque at the rear wheels over stock. This system exits dual out the rear or dual out the side, with dual 3.50-inch polished tips for added style and a custom look. The system uses all the existing factory hanger locations and includes installation instructions and all necessary hardware for an easy installation that you can do at home. Backed by Flowmaster's Lifetime Limited Warranty.- Dual 2.50-inch mandrel bent 16-gauge 409 stainless steel tubing maximizes exhaust flow and improves durability
- Dual 3.50-inch polished tips exit dual out the rear or side for a custom look
- Includes complete hardware and factory styled hangers in the stock locations for an easy installation
- 50 Series Big Block performance muffler delivers a deep, moderate performance tone and improves exhaust flow
- Flowmaster’s Lifetime Limited Warranty
- Gain up to 4 hp and 11 lbs-ft of torque at the rear wheels
- Fits 147-inch and 157-inch wheelbases
Part TypeExhaust System
BrandFLOWMASTER
Package Height15.25
Package Width16.0
Package Length63.5
Weight80.0 PG
Muffler Inlet Inside Diameter3.50 in.
Hangers IncludedYes
Main Piping Diameter2.50 in.
Tail Pipe QuantityDual
Inlet TypeFlanged
Exhaust Tip Material304 Stainless Steel
Catalytic Converter Quantity0
Muffler Body Length22 in.
Sound LevelModerate
Muffler Body Material409 Stainless Steel
Exhaust Tip CutAngled
Gasket Or Seal IncludedNo
Exhaust Tip IntercooledNo
Pipe ColorSilver
Muffler Quantity1
Muffler Inlet Outside Diameter3.63 in.
Muffler Flanged OutletNo
Exhaust Tip ResonatedNo
Muffler Outlet LocationDual
Catalytic Converter IncludedNo
Part CategoryPerformance Parts
Exhaust Tip WallDouble Wall
Exhaust Tip Quantity2
Muffler Inlet LocationCenter
Exhaust Tip FinishPolished
Exhaust Tip EdgeAngle Cut
Valve IncludedNo
Muffler TypeReflection
Pipe Material409 Stainless Steel
Muffler Body Width12 in.
Tail Pipe Tapered OutletNo
Muffler Body ShapeOval
Mounting Bracket IncludedYes
Muffler Outlet Quantity2
Muffler FinishBlack High-Temperature Paint Finish
Mount TypeUses Factory Hangers
Inlet Diameter3.50 in.
Clamps IncludedYes
FinishNatural
Exit StyleDual Out Rear
Muffler Body Height5 in.
Clamping TypeFlat Band
Muffler Flanged InletNo
Spring Bolt Kit IncludedNo
Muffler Series50 Series Big Block
Muffler IncludedYes
Exhaust Tip ConnectionClamp-On
Tail Pipe Outlet Outside Diameter2.50 in.
Valve TypeNot Applicable
Exhaust Tip Diameter3.50 in.
Part FitmentDirect Fit
Vendor Part Number818113
Package Qty1
Package TypeEA
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