The exhaust size on a 2004 Jeep Grand Cherokee is not universal; it depends on the engine and trim. In most factory configurations, the system uses roughly a 2.5-inch diameter for the main piping, with tailpipes around 2.25–2.5 inches. The two available engines for that year, the 4.0L I6 and the 4.7L V8, typically follow this pattern, though variations can exist by market or aftermarket changes.
Engine-dependent exhaust sizing
Because the Grand Cherokee offered more than one engine in 2004, the exhaust design can differ between models. The size you’ll encounter is influenced by whether the vehicle has the 4.0-liter inline-six or the 4.7-liter V8, and by factory routing such as downpipes, catalytic converters, and cat-back sections. In practice, most stock systems in this era revolve around a 2.5-inch main exhaust, with smaller tailpipes, but exact measurements can vary slightly by trim or production changes.
Common configurations by engine
4.0L inline-6 (1999–2004)
For Grand Cherokees equipped with the 4.0L inline-6, the factory exhaust piping from the downpipe through the cat-back is typically around 2.5 inches in diameter. The tailpipe diameter often falls in the 2.25–2.5-inch range. These figures reflect the standard factory setup used on many WJ-era Grand Cherokees with the 4.0L engine.
4.7L V8 (early 2003–2004)
The 4.7L V8 models generally follow a similar cat-back layout, with factory piping around 2.5 inches in diameter and tailpipes roughly 2.25–2.5 inches. Some aftermarket or regional variations exist, but the stock configuration for 2004 V8 Grand Cherokees commonly centers on a 2.5-inch system.
How to confirm your exhaust size
To determine your exact exhaust size for your specific vehicle, verify the measurement on your own or consult official documentation. Here are practical steps:
Measure the tubing directly: locate a section of the exhaust (preferably after the catalytic converter) and measure the outside diameter with a caliper or a ruler. If you can access the inside diameter, that is the most accurate measurement. For precise, model- and engine-specific sizing, reference the vehicle’s VIN with a Jeep dealership or consult the official Mopar parts catalog or service manual for your exact build date and trim.
Be aware that aftermarket systems often list sizes as 2.5" or 3" and may diverge from factory dimensions to improve performance. Always match the size to the mounting points and ensure compatibility with the rest of the exhaust layout on your vehicle.
Summary
In summary, a 2004 Jeep Grand Cherokee does not have a single universal exhaust size. Most stock configurations for the 4.0L I6 and the 4.7L V8 use about 2.5-inch piping, with tailpipes in the 2.25–2.5-inch range. For exact sizing on your particular vehicle, check the VIN with a dealer or service catalog, or measure the piping directly at the exhaust. When in doubt, rely on the factory specifications built for your engine and trim to ensure proper fit and performance.
What size exhaust pipe is on a 2004 Jeep Grand Cherokee?
WARNING:
| Pipe Diameter | Tip Size | Tip Exit |
|---|---|---|
| 2.25" | 4" | Truck Single Right Rear Exit |
What size pipe is my stock exhaust?
And so the simple answer is If you're if the end of the pipe is exposed you can just use a tape measure. And measure it line to line this one's about 2 and 1 eigh on the OD.
What is louder, 2.5 or 3 inch exhaust?
Generally, a 3-inch exhaust will produce a deeper, louder, and more aggressive tone than a 2.5-inch system. If your car isn't heavily modified, the power difference between the two sizes might be minimal, making sound the deciding factor.
How much is a 2004 Jeep Grand Cherokee worth today?
Estimated Values
Estimated Trade-In Values for the 2004 Jeep Grand Cherokee Laredo Sport Utility 4D range from about $1,000 to $1,450 depending on vehicle condition. Estimated Private Party Values range from about $2,525 to $3,300 depending on vehicle condition.