Gibson 619687 Cat-Back Single Exhaust 1997-2001 Ford Explorer / Mercury Mountaineer 4.0L V6 — 2.5in Stainless

The Gibson 619687 is a cat-back single exhaust system for the 1997–2001 Ford Explorer 4.0L and 1997–2001 Mercury Mountaineer 4.0L. Built with 2.50-inch 409 stainless steel mandrel-bent tubing and Gibson's SuperFlow chambered muffler, part number 619687 exits straight out the back with a 3-inch polished T304 stainless slash-cut tip. No welding required this is a complete bolt-on system with all factory-style hangers and hardware included. Made in the USA, backed by Gibson's Lifetime Limited Warranty.

Gibson SuperFlow Muffler — Sound Without the Drone

The heart of the Gibson 619687 is Gibson's SuperFlow muffler a baffled and chambered design with no internal packing, no fiberglass fill, and nothing to blow out over time. The dual-inlet muffler (6-inch round body, 24-inch length, 2.50-inch offset inlet and outlet) delivers an aggressive exhaust tone while keeping interior drone lower than virtually any other performance exhaust on the market. Dyno testing shows 10–15 horsepower and 15–20 lb-ft of torque gains, with the power band concentrated in the 1,800–3,000 RPM range where the Explorer and Mountaineer spend most of their time under load towing, climbing, merging, passing.

409 Stainless Mandrel-Bent Tubing

Gibson 619687 uses 409 stainless steel throughout the pipe system with mandrel bending to maintain consistent 2.50-inch diameter through every bend no crimping, no restriction. The single tip is a 3-inch polished T304 stainless slash-cut unit (clamp-on, 8 inches long) that exits behind the rear tire at the stock location. The slip-on flange connection keeps installation simple. Zinc-plated factory-style hangers use the stock rubber grommets — no drilling, no modification.

Fitment — 1997–2001 Ford Explorer & Mercury Mountaineer

Does not fit: Vehicles equipped with load-leveling suspension. Does not fit the 5.0L V8 Explorer or Mountaineer the 619687 is engineered specifically for the 4.0L V6. For the 2002–2003 Ford Explorer 4.0L/4.6L, see Gibson part number 619691.

Technical Specifications

Key Features

• Made in the USA — designed, engineered, and built by Gibson Performance Exhaust.
• Dyno-tested gains: 10–15 horsepower and 15–20 lb-ft of torque, concentrated in the 1,800–3,000 RPM power band.
• SuperFlow chambered muffler: Baffled and chambered design with no internal packing aggressive sound, minimal interior drone, and nothing to degrade over time.
• 409 stainless mandrel-bent tubing: Full 2.50-inch diameter maintained through every bend for maximum flow.
• T304 polished stainless slash-cut tip: 3-inch outlet, clamp-on design, corrosion-resistant finish.
• Straight-back exit: System exits behind the rear tire at the stock location won't affect tow trailer clearance.
• Complete bolt-on installation: Factory-style zinc-plated hangers use existing rubber grommets no welding, no drilling.
• Lifetime Limited Warranty: Gibson stands behind this system for as long as you own the vehicle.

Installation

Gibson 619687 installs using a slip-on flange connection at the factory extension pipe behind the catalytic converter. Factory rubber grommets stay in place; the welded hangers drop directly into the stock locations. All clamps and hardware are included. No welding or cutting is required on a stock vehicle. Installation time is approximately 1–2 hours with basic hand tools. System exits straight out the back, behind the rear tire, at the stock exit location. Note: the system will not fit vehicles equipped with factory load-leveling suspension.

Frequently Asked Questions

Does Gibson 619687 fit the Mercury Mountaineer?
Yes. The 1997–2001 Mercury Mountaineer 4.0L V6 shares the same platform as the Ford Explorer of the same years and is a confirmed fitment for part number 619687. Gibson's official application list includes both vehicles for all years 1997 through 2001.

Does 619687 fit 2WD and 4WD Explorer/Mountaineer models?
Yes. Gibson's application list does not distinguish between 2WD and 4WD for this fitment 619687 fits both drivetrain configurations on the 1997–2001 Explorer and Mountaineer with the 4.0L engine.

Does 619687 fit the 5.0L V8 Explorer?
No. The Gibson 619687 is engineered specifically for the 4.0L V6. The 5.0L V8 Explorer requires a different part number.

What Explorer trims does 619687 fit?
Gibson 619687 fits all trim levels of the 1997–2001 Ford Explorer 4.0L including XL, XLT, Eddie Bauer, and Limited provided the vehicle does not have factory load-leveling suspension. All trim levels of the 1997–2001 Mercury Mountaineer 4.0L are also compatible.

Will 619687 fit my 2002 or 2003 Explorer?
No. The 619687 covers 1997–2001 only. For the 2002–2003 Ford Explorer 4.0L or 4.6L, the correct Gibson part number is 619691.

What does "cat-back" mean?
Cat-back means the system replaces all exhaust components from the outlet of the catalytic converter (cat) back to the exhaust tip. The catalytic converter itself stays in place. This makes the 619687 legal in all 50 states it does not modify or remove any emissions equipment.

How much horsepower does the Gibson 619687 add?
Gibson's dyno testing shows gains of 10–15 horsepower and 15–20 lb-ft of torque on the 1997–2001 Explorer/Mountaineer 4.0L. The gains are concentrated in the 1,800–3,000 RPM range where these SUVs spend most of their time under load making the improvement feel strong in everyday driving, towing, and passing situations.

Does the Gibson 619687 drone inside the cabin?
Gibson's SuperFlow muffler uses a baffled and chambered design with no internal packing. This construction produces an aggressive exhaust tone outside the vehicle while keeping interior resonance and highway drone to a minimum Gibson claims quieter in-cab sound than competing performance exhausts.

Does installing Gibson 619687 void my factory warranty?
No. Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your vehicle's factory warranty simply because you installed an aftermarket exhaust. The Gibson 619687 is a cat-back system that does not alter emissions equipment, which further protects your warranty standing.

What warranty does Gibson offer on part number 619687?
Gibson covers the 619687 with a Lifetime Limited Warranty. Full warranty terms are available at gibsonperformance.com.

Will 619687 fit my Explorer if it has a lift kit or aftermarket suspension?
The system will not fit vehicles with factory load-leveling suspension. Aftermarket lifts may also affect fitment depending on the amount of lift and any exhaust routing changes. Gibson designs its systems on stock vehicles verify clearances if your Explorer has been lifted or otherwise modified.