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Flowmaster 817451 Force II Cat-Back Exhaust System with Series Muffler - 50

(2011-2019 Chevrolet Silverado 2500 HD; 2011-2019 Chevrolet Silverado 3500 HD; 2011-2019 GMC Sierra 2500 HD; 2011-2019 GMC Sierra 3500 HD + 4 more models)

Part of: Flowmaster Force II Cat-Back Exhaust System with Series Muffler

Other options in this family: Flowmaster 817552 Flowmaster 817491 Flowmaster 817493 Flowmaster 817603 Flowmaster 17446

Manufacturer

Picture for manufacturer Flowmaster

Part Number

817451
13 reviews
Sale Price

$1,049.95

In Stock (10+)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

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Fitment guaranteed

Fitment guaranteed

Product Details

The Flowmaster Force II Cat-Back Exhaust System delivers enhanced performance and a moderate exhaust tone for enthusiasts seeking a balance between sound and civility. This complete system connects directly after the factory catalytic converter and features the proven 50 Series "Big Block" performance muffler for improved exhaust flow and power gains.

Key Features:

  • 3.50-inch mandrel-bent stainless steel tubing for maximum flow efficiency
  • 50 Series "Big Block" performance muffler with moderate exterior exhaust tone
  • Large 4.00-inch polished 304 stainless steel tip for aggressive styling
  • Utilizes factory hanger locations for direct bolt-on installation
  • Includes all necessary hangers and hardware for easy installation
  • Premium stainless steel construction for corrosion resistance and durability
  • Backed by Flowmaster's Lifetime Limited Warranty

Designed for straightforward installation, this cat-back system requires no modifications and uses existing mounting points for a hassle-free upgrade. The mandrel-bent tubing maintains consistent diameter throughout, reducing backpressure and maximizing horsepower and torque gains while the polished tip adds a custom finished appearance.

Products specifications

Fits

2011-2019 Chevrolet Silverado 2500 HD; 2011-2019 Chevrolet Silverado 3500 HD; 2011-2019 GMC Sierra 2500 HD; 2011-2019 GMC Sierra 3500 HD; 2008-2010 Audi S5; 2001 Audi A6; 1981-1983 American Motors Eagle; 1969-1974 Alfa Romeo Berlina

Inlet Diameter

3.500 in.

Outlet Diameter

3.500 in.

Tubing Diameter

3.500 in.

Inlet Inside Diameter

3.500 in.

Outlet Outside Diameter

3.500 in.

System Type

Cat Back

Prop 65

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

California Proposition 65 Chemical Name 2

Chromium (hexavalent compounds)

California Proposition 65 Chemical Name 1

Nickel (metallic)

California Proposition 65 Chemical Name

Nickel (Metallic)

California Proposition 65 Chemical Name

Chromium (hexavalent compounds)

Heat Shield Attached

No

Material

Stainless Steel

Muffler Count

1

Exhaust Type

Single

Tip Diameter

4.000 in.

Tip Quantity

1

Exit Position

Single Side

Tail Pipe Diameter

3.500 in.

Single or Dual

Single

Title

Flowmaster 817451 Cat-back System 409S - Single Side Exit - Force II - Mild/Moderate Sound

Brand

Flowmaster

Catalytic Converter Quantity

0

Category

Exhaust

Clamping Type

Flat Band

Clamps Included

Yes

Drive

4WD

Drive

2WD

Emission Code

5

Exhaust Series

Force II

Exhaust Tip Color

Silver

Exhaust Tip Connection

Welded

Exhaust Tip Cut

Angled

Exhaust Tip Edge

Rolled Edge Angle Cut

Exhaust Tip Finish

Polished

Exhaust Tip Intercooled

No

Exhaust Tip Length

10.00

Exhaust Tip Material

304 Stainless Steel

Exhaust Tip Quantity

1

Exhaust Tip Resonated

No

Exhaust Tip Shape

Round

Exhaust Tip Wall

Single Wall

Exit Style

Single Out Side

Finish

Natural

Gasket Or Seal Included

No

Grade Type

Performance

Hangers Included

Yes

Heat Shield Included

No

Inlet Type

Flanged

Mounting Bracket Included

No

Muffler Body Material

409 Stainless Steel

Muffler Body Shape

Oval

Muffler Finish

Black High-Temperature Paint Finish

Muffler Flanged Inlet

No

Muffler Flanged Outlet

No

Muffler Inlet Connection

Slip-Fit

Muffler Outlet Connection

Slip-Fit

Muffler Outlet Quantity

1

muffler part number

Kit Only

Muffler Quantity

1

Muffler Series

50 Series Big Block

Muffler Type

Chambered

Pipe Color

Silver

Pipe Material

409 Stainless Steel

Product Type

Exhaust System

Sound Level

Moderate/Mild

Spring Bolt Kit Included

No

Sub Category

Exhaust and Tail Pipes

Tail Pipe Quantity

Single

Tail Pipe Quantity

1

Tail Pipe Tapered Outlet

No

Type

Cat-Back

Valve Included

No

Valve Type

Not Applicable

Warning

California Proposition 65

This is my second purchase from Autoplicity and both purchases were very fast and the shipping is super fast. communication was excellent as well, I will definetly recommend them for any purchases.

Easy money

Simple and easy.

Didn't see military/LEO discount =(

cant wait

great parts selection and FREE SHIPPING !! Thanks

Great website easy to use

Google search found the item I was looking for on the Autoplicity website. Item was cheaper than anyplace else. Ordering was easy using Amazon ID.

easy to navigate site and had the parts I needed at a reasonable cost.

Item price, availability & shipping price all seem good... So far...

good amd nice. pretty cool wen=bsite

good shopping experience

Amazing prices and amazing shipping speed! Best all around. Will be ordering more soon!

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