Gibson 65677B Black Elite Cat-Back Dual Split Exhaust – 2015-2020 Cadillac Escalade ESV / GMC Yukon XL Denali 6.2L – Black Ceramic Tips

Gibson 65677B is the Black Elite cat-back dual split exhaust built specifically for the 2015–2020 Cadillac Escalade ESV 6.2L and the 2015–2020 GMC Yukon XL Denali 6.2L. Mandrel-bent 409 stainless steel tubing feeds into a pair of 4-inch black ceramic-coated T-304 stainless rolled slash-cut tips — one exiting behind each rear wheel. Part number 65677B is a direct bolt-on with no welding, no cutting, and all hardware included. 50-state legal. Made in the USA. Backed by Gibson's Lifetime Limited Warranty.

Important fitment note: The Gibson 65677B fits the 6.2L engine only. It does not fit the 5.3L Escalade ESV, the standard (non-ESV) Cadillac Escalade, GMC Yukon XL SLE or SLT trims, the Chevy Suburban, or the Chevy Tahoe.

Gibson 65677B — Black Elite Series at a Glance

Why the Black Elite Series?

The standard Escalade ESV and Yukon XL Denali exhaust was engineered for silence, not character. The Gibson 65677B replaces all of that with mandrel-bent 409 stainless tubing and a Superflow CFT muffler — baffled and chambered with no internal packing material that can break down over time. The result is a deep, muscular exhaust note that fits the profile of a 6.2L V8 in a full-size luxury SUV: present and authoritative at idle, aggressive under hard acceleration, composed at highway cruise.

What separates the 65677B from Gibson's standard stainless lineup are the tips. The Black Elite Series uses T-304 stainless tips finished with a black ceramic coating — bonded at the molecular level, not painted on. They resist heat cycles, road salt, and moisture without fading or peeling. One tip exits cleanly behind each rear wheel, symmetrical and purposeful against the factory fascia.

Gibson 65677B Full Specifications

Vehicle Fitment — Cadillac Escalade ESV

6.2L engine required. Does not fit 5.3L. Does not fit standard (non-ESV) Escalade.

Vehicle Fitment — GMC Yukon XL

Denali trim with 6.2L engine only. Does not fit SLE or SLT (5.3L).

Sound, Installation & Compatibility

The Gibson 65677B exits straight out the back with one tip positioned behind each rear wheel — no cutting into the factory bumper, no trimming required on the Escalade ESV or Yukon XL Denali. All factory-style rubber hangers and clamps are included. Most owners complete the install in two to three hours with basic hand tools and a lift or jack stands.

Under the hood the Superflow CFT muffler handles the sound engineering. No fiberglass packing to burn out over time — the baffled and chambered construction is permanent and keeps interior drone well under control at 65–80 mph cruise. Under load or hard acceleration the 6.2L opens up with the deep, full-bore V8 tone these platforms deserve from the factory but never got.

Comparing the 65677B to Other Gibson Part Numbers

If you want the identical system in polished stainless tips instead of black ceramic, Gibson offers a companion part number for the same Escalade ESV and Yukon XL Denali 6.2L fitment. The 65677B is specifically the Black Elite variant — the black ceramic tip finish is the defining feature of the B suffix. The underlying tubing, muffler, and routing are the same between the two; it comes down to which tip finish suits your build.

Frequently Asked Questions

Does the Gibson 65677B fit the standard Cadillac Escalade (non-ESV)?
No. The 65677B is engineered for the Escalade ESV — the extended wheelbase version. The standard shorter-wheelbase Escalade has different underbody routing and is not a fitment for part number 65677B.

Does the 65677B fit the GMC Yukon XL SLE or SLT?
No. The 65677B fits the GMC Yukon XL Denali 6.2L only. The SLE and SLT trims run the 5.3L engine and have a different exhaust configuration. If you have a Yukon XL SLE or SLT you'll need a different part number.

Will installing the Gibson 65677B void my Cadillac or GMC factory warranty?
No. The Magnuson-Moss Warranty Act prohibits dealers from voiding your factory powertrain warranty solely because you installed an aftermarket bolt-on exhaust. The dealer would have to prove the 65677B directly caused a specific failure. Gibson's Lifetime Limited Warranty additionally covers the exhaust system itself.

Is the Gibson 65677B 50-state legal?
Yes. The 65677B is a cat-back system that replaces components downstream of the catalytic converters only. It does not alter or remove any emissions control equipment. Cat-back systems are emissions-exempt in all 50 states including California.

How does the black ceramic coating hold up over time?
Gibson's black ceramic finish on the 65677B tips is a high-temperature ceramic coat, not a paint or powder coat. It bonds directly to the T-304 stainless steel and withstands the heat cycles, road salt, and moisture that would fade or chip conventional black coatings. Under normal use the finish holds its appearance for the life of the exhaust.

Does the Gibson 65677B fit with a factory trailer hitch?
The dual split exit routes one tip behind each rear wheel rather than center-exit, which generally clears factory receiver hitches. However, aftermarket receiver extensions or weight-distribution hitches vary in size — verify clearance if you run non-factory towing hardware.

How much horsepower does the 65677B add to the Escalade ESV 6.2L?
Gibson's dyno testing shows 10–15 horsepower and 15–20 lb-ft of torque gains in the 1,800–3,000 RPM range on the 6.2L V8. These are wheel horsepower figures measured on a chassis dynamometer against the stock exhaust system.

What's the difference between 409 and T-304 stainless on the 65677B?
The 65677B uses 409 ferritic stainless steel for the mandrel-bent tubing — excellent heat and corrosion resistance for the high-temperature pipe sections. The tips are T-304 austenitic stainless, which is more corrosion-resistant and accepts the black ceramic coating more cleanly, resulting in the sharp, durable finish the Black Elite Series is known for.

Is the Gibson 65677B made in the USA?
Yes. Gibson Performance Exhaust manufactures the 65677B at their facility in Corona, California.

What does Gibson's Lifetime Limited Warranty cover on the 65677B?
Gibson's Lifetime Limited Warranty covers defects in materials and workmanship for the life of the original purchaser's vehicle. It is separate from and in addition to your factory vehicle warranty, which remains intact under the Magnuson-Moss Warranty Act.