$7,000 Summertime Mustang Build Enter Now!
Talk to a Mustang Expert
1-888-332-7930
Mon - Sun, 8:30 AM EST - 11:00 PM EST

Free Shipping On Orders Over $49. Details

Flowmaster High-Performance Catted Y-Pipe (99-04 V6)

Flowmaster High-Performance Catted Y-Pipe (99-04 V6)
14 Reviews 6 Answers
Market Price $687.47 You Save 12% ($79.09)
Our Price

$608.38

FREE Shipping
  • Item 18464

  • MPN# 2020023

In Stock Ships same business day. Choose options to add to cart
Add to Cart
Save for later

Features & Details

  • 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

Product Resources

Submit the first photo Customer Reviews (14) Questions (9) & Answers (6)
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.

Fitment: 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (1) Catted Y-pipe
  • (2) clamps
Installation Info
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
Will it fit my Mustang?
  • V6 - 99, 00, 01, 02, 03, 04

Most Helpful Reviews

4/5
happy with this buy

I am very happy with the price of the product. I started with putting 40 series cat back dual exhaust, but i needed a new driver side cat. I had quoted a shop and they were going to charge me about 1,500 ...

Read More
Helpful (5)

5/5
Great product

I bought this because my mid pipe broke so i figured i might as well upgrade. Install was pretty easy, i comes in three different pieces so it was manageable with two people. Didn't really have to force ...

Read More
Helpful (1)

Overall Rating 4.6 out of 5 stars
Read All 14 Reviews

Customer Photos

Submit the first customer photo and get $5 off your next purchase!

You Might Also Like

9 Questions / 6 Answers

Ask a Question

How much horsepower will this add? What is the difference between this and the Pypes catted X-pipe

ACP4

  • The amount of HP that you will add with this bolt-on depends on what mods you already have done to the car. A y-pipe is a 2-into-1 pipe that is made for the stock single exit exhaust. An x-pipe is made for true dual exhaust and will flow much more than a 'y'.

    Brazen11

Helpful (1)

I have the flow master dual cat backs already installed. I have clogged cats now and would like to replace them with this catted y-pipe. Will it fit in with the flow masters i already have?

Superman

  • Hello! Yes this will work in conjunction with your Flowmaster catback!

    Doug P

Helpful (0)

I have glass pack dual exhaust system would that work wt my 2002 v6 3.8 mustang ?

Junebugg

  • As long as the dual exhaust system has a connection for the Y-pipe then yes, it will work.

    JeffAM

Helpful (0)

Will this work with bbk shoe is ceramic headers?

Jake

  • As long as they are shorty headers, these will fit no problem.

    JeffAM

Helpful (0)

Silly question but I feel the need to ask.... Will this hook up to a Flowmaster force 2 duel exhaust cat back system already installed? Thanks

Mitzimitzu

  • The Flowmaster High-Performance Catted Y-Pipe (99-04 V6) will work with the Flowmaster Force II Dual Cat-Back Exhaust (99-04 V6), item # 18420, (http://www.americanmuscle.com/flowmaster-force2-catback-9904v6.html).

    AshleyK

Helpful (0)

Would this exhaust work with the v6 dual exhaust adapter kit by pacesetter? As in i want to buy a GT catback to have dual exhaust from the headers to the tips.

Franky

  • Hi, This Flowmaster High-Performance Catted Y-Pipe can be used with the PaceSetter V6 Dual Exhaust Adapter Kit you will have to cut off the Y-pipe and clamp the adapter in its place, I suggest having a shop do that because its must be perfectly cut.

    Chris J

Helpful (0)

More Products You Might Like

Customer Reviews (14) Write a Review

Overall Rating 4.6

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume 3.857143 3.9
  • Exhaust Note 4.428571 4.4
  • Fit & Finish 4.214286 4.2
  • Bang For Your Buck 4.571429 4.6



  • 4/5

    Installation Time: Afternoon

    April 21, 2013

    happy with this buy

    I am very happy with the price of the product. I started with putting 40 series cat back dual exhaust, but i needed a new driver side cat. I had quoted a shop and they were going to charge me about 1,500 to do it. So i ventured onto american muscle and found the flowmaster catted perfomance y-pipe and couldn't beat the price. So it is flowmaster from the headers back. Next step is the cool air intake!!! Which i will be getting from American muscle.

    babgrl817

    Year: 2001 Submodel: V6 Franklinville, Franklin, NJ, USA

    Helpful (5)

  • 3/5

    Installation Time: Afternoon

    April 14, 2017

    HOOKER EXHAUST Y PIPE WITH CATALYST

    PRODUCT IS GREAT and THE OPERATOR WHO HANDLED THE CALL WAS GREAT, EXHAUST CLAMP WAS MISSING FROM BOX, AND THE BUNG PLUGS WHERE NOT TIGHT. LOST PLUG,

    AlbertF

    Year: 2003 Submodel: V6

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    March 18, 2017

    Great product

    I bought this because my mid pipe broke so i figured i might as well upgrade. Install was pretty easy, i comes in three different pieces so it was manageable with two people. Didn't really have to force anything too much. I did notice a much smoother drive than before which i was very pleased with this Y pipe.

    RonnieH

    Year: 2004 Submodel: V6

    Helpful (1)

  • 5/5

    Installation Time: Less than 1 Hour

    February 24, 2017

    So much smoother!

    Got the y pipe really fast! The welds were amazing and it looked so clean. A shop was charging me $1,800 for a catted y pipe so at this price you definitely can't beat it. I was worried it wasn't gonna fit but took it to a shop and got charged $100 and it fit perfectly!! The noise isn't loud. It does give it a deeper tone but not loud at all. It made my car run so much smoother and actually it got a bit faster. It regained all its lost power and it runs and sounds amazing!!! Thanks american muscle!!

    AlexisC

    Year: 2002 Submodel: V6

    Helpful (1)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    December 28, 2016

    Excellent for Performance!

    I got my entire exhaust system from American Muscle and went from sound to performance. It runs incredibly now. (2004 40th Anniversary mustang)

    Kac

    Year: 2004 Submodel: V6

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    September 18, 2016

    Awesome sound

    I brought this because my catalytic covertes were wrong and I need to past the inspection but this was the best decision, sound is perfect and add a little bit of hp to the car, I have mad dual exhaust and this is the perfect combination, looking forward to but some headers Thanks American mucke

    Mike

    Year: 2000 Submodel: V6

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    July 02, 2016

    Very happy!

    Now we want to get the rest, when the price is right. It is well built. Thank you, Sally

    mustangsally

    Year: 2000 Submodel: V6

    Helpful (1)

  • 4/5

    Installation Time: Afternoon

    November 14, 2015

    Catrick Y-Pipe

    The product looks awesome. Before you put it on, you can tell your V6 will turn into a beast! I can tell the performance has changed already! Looking forward to getting better mileage and more stares at my awesome ride!

    MissRight25

    Submodel: V6 Las Vegas, NV

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    September 24, 2015

    2003 v6 clogged cats

    $160 shop install. 2.5 hours. More hp, better mpg, high quality. V6 so not loud. Free flowing. Good welds.

    Marcus478

    Year: 2003 Submodel: V6 Americus Ga

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    June 14, 2015

    Coo Catt

    Product arrived exceptionally quick! Took it to the shop for the install. I didn't make any other modifications so the sound is reminiscent of the stock not loud at all. I wasn't looking for sound so everything is good so far!

    Vegas

    Year: 2004 Submodel: V6 Lake Charles

    Helpful (1)

  • 4/5

    Installation Time: Afternoon

    April 29, 2014

    Not a typical DIY

    The fitment of the left side was off. I removed and installed in about 1 1/2 hrs but had an exhaust leak at the connection to the shorty header. I had to cut off the pipe just in front of the first CAT then cut a wedge off the pipe rotate about 15-20 degrees and weld it back to the CAT. After the modification it worked beautifully.

    HALOJM

    Year: 2002 Submodel: V6 Vernal, UT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    February 01, 2014

    nice sound

    this with the combo of the duels that I also purchased turned my v6 into a v8 sound. what a difference.

    sunshine

    Year: 2004 Submodel: V6 Hawaii, USA

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    December 20, 2013

    Tricky Satisfaction

    After doing a lot of research and waiting for the right time to get this product on my 03 V6, I have to say the wait and the headache were well worth the wait. I bought this mid pipe about 2 months ago and have been dying to get them on my car with my BBK shorties. After taking it to a DIY shop, I realized this wasn't gonna be a DIY job and decided to take it to a shop and after waiting two days i got my car back with my Shorties and Mid pipe installed and immediately heard and felt a difference. With the BBK Shorties and Magnaflow Dual Exhaust system i bought. The whole package has made me a happy camper. If you are still debating on whether to buy this product, stop debating and order them now. GREAT BUY AND GREAT SOUND. AM has knocked it out of the park like always. Will post a pic shortly

    SGTdavila

    Year: 2003 Submodel: V6 Havelock, NC

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    July 08, 2017

    2000 mustang

    Great product we had our mechanic install this for us!!!!!

    Tjev

    Year: 2000 Submodel: V6

    Helpful (0)

Related Mustang Categories