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Flowmaster 817603 Force II Cat-Back Exhaust System with Series Muffler - 50

(2011-2018 Chevrolet Silverado 1500; 2011-2018 GMC Sierra 1500; 1987-1990 BMW 325i Base; 2004-2007 BMW 525i Base; 1981-1983 American Motors Eagle DL SX4)

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

Other options in this family: Flowmaster 817552 Flowmaster 817451 Flowmaster 817491 Flowmaster 817493 Flowmaster 17446

Manufacturer

Picture for manufacturer Flowmaster

Part Number

817603
10 reviews
Sale Price

$1,117.95

3 left at this price

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

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No Hassle Returns

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Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Flowmaster Force II Cat-Back Exhaust System delivers maximum performance and aggressive sound through advanced engineering and quality construction. This complete exhaust system is designed to replace your factory exhaust from the catalytic converter back, providing significant improvements in horsepower, torque, and exhaust flow.

Key Features:

  • 50 Series Big Block Performance Muffler with Delta Flow technology for deep, aggressive tone
  • Large 3.50-inch mandrel-bent stainless steel tubing maintains consistent diameter for optimal flow
  • Dyno-tuned design maximizes horsepower and torque gains across the RPM range
  • Premium stainless steel construction resists corrosion and maintains appearance
  • Utilizes factory hanger locations for straightforward bolt-on installation
  • Includes all necessary hardware and components for complete installation

Flowmaster's Delta Flow technology uses a unique internal design that balances performance with sound control, creating the signature aggressive muscle car tone without excessive drone. The mandrel-bent tubing eliminates restrictive crimps and maintains full diameter through all bends, ensuring unrestricted exhaust flow. Backed by Flowmaster's Lifetime Limited Warranty, this system is engineered for enthusiasts who demand both performance and durability.

Products specifications

Fits

2011-2018 Chevrolet Silverado 1500; 2011-2018 GMC Sierra 1500; 1987-1990 BMW 325i Base; 2004-2007 BMW 525i Base; 1981-1983 American Motors Eagle DL SX4

Inlet Diameter

3.500 in.

Outlet Diameter

3.500 in.

Tubing Diameter

3.500 in.

Inlet Inside Diameter

3.500 in.

Outlet Outside Diameter

4.000 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 817603 Cat-back System 409S - Single Side Exit - Force II - 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

Clamp-On

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

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

Best prices anywhere

Great product, fast shipping...will do business with again! Thank you!

Easy check out. the new system is a lot better than the old one. Ability to reorder items is a good feature too. We do several thousands of dollars here a here and love to see the upgrades going through.

First time ordering looks good so far

good, competitive pricing

Everything went smoothly, love the prices and the ease of transaction, hope to buy from you real soon, Nice people.

Thank you

Smooth so far good price.

It was a pleasure to do business with Autoplocity and would definately buy from again and or recommend to anybody. Item was shipped out fast with great packaging and communication was top notch.<br><br>Thanks again!

I will definitely buy from this seller again! The part actually got here a day early!! Thanks again!!

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