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Gibson 5665 Dual Extreme Cat-Back Exhaust System Aluminized

(2014-2018 Chevrolet Silverado 1500 High Country/LTZ; 2014-2018 GMC Sierra 1500 Denali/SLT)

Part of: Gibson Performance Exhaust Dual Extreme Cat-Back Exhaust System

Other options in this family: Gibson Exhaust 9704 Gibson Exhaust 5403 Gibson Exhaust 5587 Gibson Exhaust 65587 Gibson Exhaust 65402

Manufacturer

Picture for manufacturer Gibson Exhaust

Part Number

5665
13 reviews
Sale Price

$825.69

Estimated ship date Monday, November 16

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Product Details

The Gibson 5665 Dual Extreme is a bolt-on cat-back exhaust system engineered for truck enthusiasts who demand aggressive performance and a commanding exhaust note. Constructed from aluminized mandrel-bent tubing, this dual-exit system replaces all piping behind the catalytic converter and routes each side behind the rear tires for a bold, symmetrical look.

The system features a 3.5-inch primary headpipe that splits into dual 2.25-inch mandrel-bent tailpipes, finished with polished T304 stainless steel 4-inch rolled slash-cut tips (2.25-inch inlet, 4.0-inch outlet, 12-inch length). The Gibson baffled and chambered muffler design delivers an aggressive exterior sound with minimal interior drone — no internal packing means the tone stays consistent over the life of the system.

Key Features:

  • Dual cat-back design with exits positioned behind the rear tires at an aggressive angle
  • 3.5-inch aluminized mandrel-bent headpipe splits to dual 2.25-inch tailpipes
  • Dyno-tested for an average gain of 15–20 horsepower on stock vehicles
  • Baffled and chambered muffler — no internal packing, minimal interior drone
  • Polished T304 stainless steel 4-inch rolled slash-cut tips included
  • Uses factory mounting points — no cutting or welding required
  • Includes all necessary clamps and hardware for a straightforward bolt-on install
  • Backed by Gibson's Lifetime Limited Warranty
  • Made in the USA

The Gibson 5665 is a direct-fit, bolt-on upgrade that delivers real performance gains alongside a deep, aggressive exhaust tone. With no fabrication required and all hardware included, installation is straightforward for the experienced DIYer or professional shop.

Products specifications

Fits

2014-2018 Chevrolet Silverado 1500 High Country/LTZ; 2014-2018 GMC Sierra 1500 Denali/SLT

Muffler Dimension

8 in. Round Body; 3 in. Offset Intlet;2.25 in. Dual Outlet; ; L-24 in.

Muffler Description

Baffled and Chambered Muffler Design, No internal Packing, Minimal Interior Drone, Aggressive Sound

Material

Aluminized

Tubing Diameter

3.5-in./2.25-in.Aluminized mandrel bent tubing.

Prop 65

Yes

Tip Description

4in. Polished T304 Stainless Rolled Slash-Cut Tip. Clamp on.

Exit Position

Exits Behind Each Rear Tire.

Tip Specifications

Inlet 2.25 in.; Outlet 4.0 in.; L-12 in.

Outlet

Dual

Category

Truck and SUV

Inlet Inside Diameter

3.000 in.

Muffler Type

Chambered

Tail Pipe Diameter

2.250 in.

Tip Logo

None

Exit Style

Straight

Outlet Outside Diameter

2.250 in.

Muffler Body Length

24.000 in.

Exhaust Type

Dual

Tubing Diameter

3.500 in.

System Type

Cat Back

Tip Diameter

4.000 in.

Exit Position

Front of Rear Tire

GREAT!!!!!!

so far so good, looks like it will fit

excellent shopping experience

Great prices, fast shipping and good customer services.<br>Thanks a lot

Fast shipper, although I had some trouble placing the order online

Prompt and quick service... no hassle...

Very easy and convenient. Shipping was a bit stiff, but this isn't the lightest package either.

Website is precise, loads quickly. easy shopping

Quick

hope works out

cheap and quick

Great Service

Best price around, very fast shipping and great service! I will buy from them again!

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