2024-2025
2015-2023
2010-2014
2005-2009
1999-2004
1994-1998
1979-1993
Installation Time
(approx) 2 Hours
Difficulty Level:
Light to Moderate mechanical skill required.
Installation Guides
- Customer Submitted:
- How to Install Flowmaster High-Performance Catted Y-Pipe on your Ford Mustang
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Flowmaster High-Performance Catted Y-Pipe (99-04 V6)Find parts that fit my vehicle
Item 18464
$0.00
20 Reviews
12 Answers
Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features
- Improves Exhaust Flow and Sound
- Classic Muscle Car Rumble
- 2-1/4" Mandrel-Bent Stainless Steel Tubing
- High Flow Catalytic Converters Included
- 49 State Emissions Legal
- For Use with Stock Manifolds or Shorty Aftermarket Headers
- Fits 1999-2004 V6 Mustangs
Description
Regain Lost Power. Replace those clogged or blown-out stock catalytic converters with high performance Flowmaster replacements to regain lost horsepower and torque.
Muscle Car Rumble. This free flowing Flowmaster Mid Pipe will not only improve performance, but it will also add a deep muscle car rumble to the sound of your exhaust with its classic "Y" crossover pipe design.
Quality Construction. Constructed in the USA from durable 2.25" 16 gauge 409 stainless steel tubing for it's corrosion resistant properties this Flowmaster Y-Pipe features four high flow catalytic converters, two main cats and two pre-cats. The included catalytic converters feature a durable ceramic substrate material making them perfect for naturally aspirated applications.
49 State Legal. The included catalytic converters meet or exceed USEPA standards and are 49 state emissions legal. They are not legal for use in the state of California.
Application. This Flowmaster High Performance Catted Y-Pipe is designed to be a direct bolt-on replacement for the 1999-2004 3.8L or 3.9L V6 Mustangs with either aftermarket shorty headers or the stock manifolds installed.
Muscle Car Rumble. This free flowing Flowmaster Mid Pipe will not only improve performance, but it will also add a deep muscle car rumble to the sound of your exhaust with its classic "Y" crossover pipe design.
Quality Construction. Constructed in the USA from durable 2.25" 16 gauge 409 stainless steel tubing for it's corrosion resistant properties this Flowmaster Y-Pipe features four high flow catalytic converters, two main cats and two pre-cats. The included catalytic converters feature a durable ceramic substrate material making them perfect for naturally aspirated applications.
49 State Legal. The included catalytic converters meet or exceed USEPA standards and are 49 state emissions legal. They are not legal for use in the state of California.
Application. This Flowmaster High Performance Catted Y-Pipe is designed to be a direct bolt-on replacement for the 1999-2004 3.8L or 3.9L V6 Mustangs with either aftermarket shorty headers or the stock manifolds installed.
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Installation & What's in the Box
Installation Info
What's in the Box
- (1) Catted Y-pipe
- (2) clamps
Tech Specs
Mid Pipe Specifications
| Style Mid Pipe: | "Y" | Type Headers Required: | Shorty or stock manifolds |
| Piping Material: | Stainless Steel | Piping Size: | 2.25" |
| Catalytic Converter: | "Yes" | Fitment: | 1999-2004 V6 Mustangs |
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