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Flowmaster Catted H-Pipe (99-04 GT)

2 Reviews
Our Price

$644.10

  • Item #18465
  • MPN# 2020027

  • Market Price $714.99
  • You Save 10% ($70.89)
In Stock Ships same business day.
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Customer Photos
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 GT and Bullitt Mustangs
Description
Improves Flow For More Power. Improve the horsepower and torque of your 4.6L GT Mustang by replacing those restrictive stock factory cats with a brand new Flowmaster H-Pipe that features high-flow catalytic converters. The Flowmaster high flow catted H-pipe will significantly improve your Mustang's exhaust flow for a notable increase in 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 "H" 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 H-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 H-Pipe is designed to be a direct bolt-on replacement for the 1999-2004 4.6L V8 Mustangs, including the GT and Bullitt models with either aftermarket shorty headers or the stock factory manifolds installed.

Technical note: 2004 Mustangs require the use of 24" O2 sensor plug-in extender wires.

Fitment: 1999 2000 2001 2002 2003 2004 Details

Won't fit? Add an exception

What's in the Box
  • (1) Catted H-pipe
  • (2) clamps
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: Standard length "H" Type Headers Required: Shorty or stock manifolds
Piping Material: Stainless Steel Piping Size: 2.25"
Catalytic Converter: "Yes" Fitment: 1999-2004 GT & Bullitt Mustangs
Will it fit my Mustang?
  • Bullitt - 01
  • GT - 99, 00, 01, 02, 03, 04

Most Helpful Reviews

5/5
Flowmaster Catted H-Pipe

Passed Colorado emissions. Good sound with Bassani Cat Back exhaust. No drone. Fitment with Bassani cat back required some cutting & welding to line up the rear exhaust tips. Very pleased with performance ...

Read More
Helpful (0)

5/5
GREAT

Adds a little bit and made a better sound over stock highly recommend it!!

Helpful (0)

Read All 2 Reviews
Overall Rating 5 out of 5 stars

Customer Photos (2) View All Photos

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Q & A

Ask a Question

Would I install this together with the flowmaster catback exhaust system you have on your site as well?

SOUTHBOY Year: 2003 Model: GT

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

HP gain? How much horsepower does this exhaust add?

Darron757 Year: 2002 Model: GT

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Customer Reviews (2) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Shop Install

Installation Cost:$100-$250

  • Loudness / Volume 5 5
  • Exhaust Note 5 5
  • Fit & Finish 5 5
  • Bang For Your Buck 5 5



  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    May 23, 2013

    Flowmaster Catted H-Pipe

    Passed Colorado emissions. Good sound with Bassani Cat Back exhaust. No drone. Fitment with Bassani cat back required some cutting & welding to line up the rear exhaust tips. Very pleased with performance & quality.

    CRstang99

    Year: 1999 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Denver, CO, USA

    Helpful (0) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    April 02, 2013

    GREAT

    Adds a little bit and made a better sound over stock highly recommend it!!

    JoshE

    Year: 2003 Model: GT

    Helpful (0) (0)

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