1999-2004 Ford Mustang GT 4.6L V8 Dual Rear Exit Catback Exhaust
This catback exhaust is engineered as a direct-fit replacement for the factory mid-pipe-to-rear-bumper section on 1999-2004 Ford Mustang GT models equipped with the 4.6L V8 engine. The kit uses a dual rear-exit layout with a single straight-through muffler, 2.5-inch 304 stainless steel main piping, and dual black-sprayed 304 stainless steel tailpipes. It bolts on at the factory catalytic converter and primary oxygen sensor locations, so no welding or tune is required for installation. The system is designed for 2-door coupe and 2-door convertible body styles, making it a practical upgrade for daily-driven New Edge Mustangs as well as weekend builds.
Specifications
| Product Type | Catback Exhaust System |
|---|---|
| System Configuration | Dual Rear-Exit Catback |
| Main Pipe Diameter | 2.5 in OD |
| Muffler Configuration | Single Straight-Through Muffler |
| Tip Quantity | 2 |
| Tip Finish | Black-Sprayed 304 Stainless Steel |
| Main Piping Material | 304 Stainless Steel |
| Inner Perforated Pipe (Muffler) | 409 Stainless Steel |
| Muffler Shell / End Cap | 304 Stainless Steel |
| Bending Process | Mandrel Bend |
| Installation | Bolt-On; No Welding Required |
| Gross Weight | 21.2 kg (46.7 lbs) |
| Package Dimensions (L x W x H) | 92 x 47 x 31 cm |
Key Features
- Dual Rear-Exit Catback Layout: Replaces the factory mid-pipe-to-tip section with a true dual rear-exit configuration that ends in a single straight-through muffler feeding two tailpipes, giving the New Edge Mustang a balanced rear-bumper exit.
- 2.5-Inch 304 Stainless Steel Piping: The main tubes are mandrel-bent from 304 stainless steel to maintain a consistent inner diameter, which keeps exhaust flow more uniform than the crush-bent factory piping.
- Straight-Through Muffler With 409 Stainless Core: The single muffler uses a 409 stainless steel perforated inner pipe to take the edge off high-frequency noise while still delivering a more aggressive exhaust note than the baffled factory muffler.
- Black-Sprayed 304 Stainless Steel Tips: Dual 304 stainless steel tailpipes finished in a black sprayed coating resist corrosion from road salt and acid rain while creating a stealthy, contrasting look against polished stainless components.
- Bolt-On Install With Full Hardware: The system mounts at factory locations using the included gaskets, bolts, nuts, clamps, brackets, hangers, and instruction manual — no welding, cutting, or tuning is required for a basic install.
Product Content
This dual rear-exit catback system is designed to replace the original middle and rear section of the factory exhaust on the 1999-2004 Ford Mustang GT 4.6L V8. By replacing the factory mid-pipe-to-tip assembly with 2.5-inch 304 stainless steel piping and a single straight-through muffler, the kit reduces restrictions in the exhaust path while keeping the catalytic converters and primary oxygen sensors in their factory positions. The dual black-sprayed 304 stainless steel tailpipes exit at the rear bumper on both sides for a balanced look.
The kit is intended for owners who need to replace a worn or rusted factory exhaust, or for enthusiasts looking to upgrade the sound and appearance of their New Edge Mustang GT. Because the system bolts on at the factory catalytic converter and uses the original mounting points, it is a practical fit for daily-driven vehicles as well as project builds. The included gaskets, bolts, nuts, clamps, brackets, hangers, and instruction manual support a true in-place installation.
Check Before Ordering
- Confirm your vehicle is a 1999-2004 Ford Mustang GT equipped with the 4.6L V8 engine. This kit does not fit V6 (3.8L or 3.9L) models.
- Confirm the body style is a 2-door coupe or 2-door convertible. 4-door variants are not covered by the current SKU.
- Confirm the factory catalytic converters and primary oxygen sensors are intact and in their original locations, since the system bolts on behind these emissions components.
- Have the basic hand tools (socket wrench set, penetrating oil, jack and jack stands) on hand, plus a new gasket set if you are replacing aged factory hardware.
Shipping & Returns
Free U.S. Shipping: Orders are typically processed within 1–2 business days and delivered within 7–9 business days. Additional charges may apply to remote areas.
30-Day Returns: Unopened and unused items in their original packaging may be returned within 30 days of receipt. Return shipping is covered for verified quality issues.
Worry-Free Delivery: Optional protection against eligible loss, theft, delay, or transit damage is available at checkout.
Fitment & Compatibility
- Fits factory-equipped vehicles with listed configurations.
- ✅Please confirm vehicle specifications before ordering.
| YEAR | MAKE | MODEL | ENGINE | BODY |
|---|---|---|---|---|
| 1999-2004 | Ford | Mustang | 4.6L V8 | Convertible — 2 Door Coupe — 2 Door |
1999-2004 Ford Mustang GT 4.6L V8 Catback Exhaust FAQs
Q1: What year range does this catback exhaust fit?
A1: This kit fits 1999, 2000, 2001, 2002, 2003, and 2004 Ford Mustang GT models equipped with the 4.6L V8 engine. It is engineered as a direct bolt-on replacement for the factory mid-pipe-to-rear section on these vehicles.
Q2: Does this catback work on a V6 Mustang?
A2: No. This kit is engineered exclusively for the 4.6L V8 Mustang GT. The 2.5-inch piping diameter and flange layout will not bolt up to a 3.8L or 3.9L V6 model, so V6 buyers need a different SKU.
Q3: Does the kit fit both coupe and convertible body styles?
A3: The current SKU is confirmed for 2-door coupe and 2-door convertible body styles on the 1999-2004 Mustang GT. 4-door variants are not covered by this SKU, so verify your body style before ordering.
Q4: Will installation require welding?
A4: No welding is required. The system is a true bolt-on install that uses the factory catalytic converter connection and the original mounting points; included brackets and hangers match the factory Mustang GT exhaust layout.
Q5: What is included in the box?
A5: The package includes the catback exhaust assembly, gaskets, bolts, nuts, clamps, mounting brackets and hangers, and an instruction manual. The factory catalytic converters, primary oxygen sensors, and factory mid-pipe are reused.
Q6: What is the main pipe diameter and material?
A6: The main piping is 2.5 inches in outer diameter, mandrel-bent from 304 stainless steel to keep a consistent inner diameter. The muffler's inner perforated core pipe is 409 stainless steel for heat tolerance, while the muffler shell, end caps, and tailpipes are 304 stainless steel.
Q7: Will this catback trigger a Check Engine Light (CEL)?
A7: On its own, the kit is designed to retain the factory catalytic converters and primary oxygen sensors, so the factory emissions system is not disturbed. As with any exhaust change, the actual result depends on the rest of your vehicle's setup and tune state.
Q8: Can I pair this catback with other Mustang GT performance upgrades?
A8: Yes. The kit is a foundational upgrade and can be paired with high-flow air intakes, aftermarket mid-pipes or headers, and ECU tuning to further improve airflow and throttle response on the 4.6L V8. Verify compatibility with any other aftermarket components before installation.
Q9: How much does the complete system weigh?
A9: The complete catback system has a gross weight of 21.2 kg (approximately 46.7 lbs) per the published specifications. Package dimensions are 92 x 47 x 31 cm.
Q10: Does this kit replace a damaged or rusted factory exhaust?
A10: Yes. The kit replaces the factory mid-pipe-to-rear bumper section on 1999-2004 Mustang GT 4.6L models, making it a complete solution for owners replacing a worn, corroded, or damaged factory exhaust.
Q11: What kind of exhaust sound should I expect?
A11: Replacing the baffled factory muffler with a straight-through design produces a crisper, more aggressive exhaust note at mid-to-high RPM, while remaining suitable for daily street driving. Drone and interior noise will vary with the rest of your exhaust and vehicle setup.
Q12: Is professional installation required?
A12: Professional installation is not required, though it is helpful. The kit is designed for an in-place bolt-on install using the included hardware and instruction manual, so experienced DIY owners can complete the job with a basic socket set, a jack, and jack stands on a level surface.