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Gibson

Gibson 14-18 GMC Sierra 1500 Denali 6.2L 3.5in/2.25in Cat-Back Dual Extreme Exhaust - Aluminized

$1,569.62 $646.30 Save $923.32

SKU: G003 5665

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Special Order
Ships in 4–6 weeks
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$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

This dual bolt-on Cat-back system is designed for enthusiasts seeking to upgrade their truck's performance and appearance. It features an aggressive exit behind the rear tires, delivering a powerful exhaust tone. Dyno-tuned and tested, it provides average gains of 15-20 horsepower. The system includes Gibson's Superflow™ CFT muffler, which is baffled/chambered with no internal packing, ensuring an aggressive sound with minimal interior drone. It's constructed from aluminized mandrel-bent tubing for improved flow and complemented by polished stainless steel slash-cut clamp-on tips. Installation is a hassle-free bolt-on process with no welding required, utilizing factory-style hangers and all necessary hardware. It is proudly Made in the USA (Corona, CA) and backed by a Lifetime Limited Warranty. It is also 50-state legal.
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Part #: 5665

For the extremist who wants to take their truck to the next level, this dual bolt-on Cat back system is for you. This system exists behind the rear tires at an aggressive angle with a powerful exhaust tone. You will gain bold street looks with powerful dyno tuned and tested street performance gains. You can expect to experience gains on average of 15-20 horsepower. Gibson muffler provides a mean performance sound and complemented with polished Stainless Tip. Easy bolt-on installation. No welding required. Backed by a Lifetime Limited Warranty. If you want Extreme, this system is it.

Features:

  • Aluminized Mandrel Bent Tubing
  • Superflow (TM) CFT Muffler
  • Baffled/Chambered Muffler; No Internal Packing
  • Minimal Interior Drone - Aggressive Sound
  • Polished Stainless Slash-Cut Clamp On Tips
  • Incl. All Hardware/Factory Style Hangers
  • Hassle Free Bolt-On Installation
  • Lifetime Limited Warranty

Cat-Back Dual Extreme Exhaust System | Aluminized

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

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Specifications

BrandGibson
Part NumberG003 5665

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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