WIN $5,000 For Your Mustang! Enter Now
Talk to a Mustang Expert
1-888-332-7930
Mon-Thu 8:30a-11p, Fri-Sun 8:30a-9p

Free Shipping - Get it by Dec. 24th available on most items - Details

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

Market Price $687.47 You Save 12% ($79.09)

$608.38

FREE Shipping
  • Item 18464
  • MPN# 2020023

In Stock Ships same business day. Choose options to add to cart

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
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

5/5
Very happy!

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

Helpful (1)

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)

Overall Rating 4.7 out of 5 stars
Read All 9 Reviews

Customer Photos

You Might Also Like

6 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

    Good Answer (0) (0)

Answer This Question I need this answered (1) (0)

Fitting Issues I already have a Magnaflow Dual Exhaust for my 04 V6. Just wondering would this product fit well with my exhaust

EGalvan

  • Yes, i bought this right after i installed my Magnaflows and they sound awesome.

    SGTdavila

    Good Answer (0) (1)

Answer This Question I need this answered (0) (0)

This or H pipe for MAC Dual Exhaust conversion kit? I currently have the MAC Dual Exhaust Conversion Kit on my 2003 mustang v6 and wanted to do more to get that classic growl/rumble. Would it be possible to get an H pipe that will connect to this or would it be better to just get the Flowmaster high performance catted Y pipe?

JakeD39

  • In an H-pipe, the two exhausts are connected, but the do not merge into one, as they do in a Y-pipe. It appears off-road H-pipes are available for the V6. For on-road (catted) applications, some custom exhaust work may be required.

    Crewwolfy

    Good Answer (0) (0)

Answer This Question I need this answered (0) (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

    Good Answer (0) (0)

Question Resolved

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

    Good Answer (0) (0)

Question Resolved

I have the Mac dual conversion exhaust kit for my 2000 v6,would this bolt right up to it or would the piping be different?

Francisco22

  • The Flowmaster High-Performance Catted Y-Pipe (99-04 V6) feature a 2.25" stainless steel tubing while the MAC Dual Exhaust Conversion Kit (99-04 V6), item # 40048, (http://www.americanmuscle.com/99-04-v6-mac-catback.html) features a 2.5" aluminized steel tubing. Since they are two different sizes, they will not directly bolt together. You may need to do some cutting and welding to have a proper install. We recommend professional installation of both these items.

    AshleyK

    Good Answer (0) (0)

Question Resolved

More Products You Might Like

Customer Reviews (9) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume 4.111111 4.1
  • Exhaust Note 4.555555 4.6
  • Fit & Finish 3.888889 3.9
  • Bang For Your Buck 4.555555 4.6



  • 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) (0)

  • 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) (0)

  • 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) (0)

  • 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) (0)

  • 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) (0)

  • 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) (0)

  • 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) (0)

  • 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) (0)

  • 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 (0) (0)

Related Mustang Categories