ARH Long Tube Headers 1-3/4" With Catted X-Pipe 2-1/2" Stainless Steel Cobra/Mach 1 1999-2004

American Racing Headers: MSTE4V34WC
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ARH Long Tube Headers 1-3/4" With Catted X-Pipe 2-1/2" Stainless Steel Cobra/Mach 1 1999-2004
ARH Long Tube Headers 1-3/4" With Catted X-Pipe 2-1/2" Stainless Steel Cobra/Mach 1 1999-2004 Play ARH Long Tube Headers 1-3/4" With Catted X-Pipe 2-1/2" Stainless Steel Cobra/Mach 1 1999-2004 Video 1
American Racing Headers

Product Description

American Racing Headers Stainless Steel 1-3/4" Long Tube Headers with a 2-1/2" Catted X-Pipe for 1999-2004 Cobra Mustangs and Mach 1 Mustangs.

1999-2004 4V Mustang owners now have something to cheer about! American Racing Headers now has long tube header systems for you. Manufactured from 304 stainless steel, ARH's longtube systems are engineered for a great fit and outstanding horsepower and torque gains throughout the RPM range. Positioned wide in engine compartment to allow easy transmission removal. Made in the U.S.A.

- Merge collectors with scavenger spikes
- Direct bolt-in catted X-pipe
- Ultra high-flow 200 cell metallic substrate cats

- 100% leak free one-piece long tube design
- 3/8" thick flanges with tig welded & hand ported inlets
- 1-3/4" primaries to accommodate normally aspirated or supercharged applications

*Available with or without EGR fittings.

Similar Mustang Parts

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Installation Instructions


Difficulty: Difficult

Mustang Applications

This product will fit the following Ford Mustang years:

Product Reviews

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Product Questions

on a 2004 mach 1 mustang does the long tube headers have to be removed to pull the transmission? how is the ground clearance verses the stock exhaust?

Asked by: Hooks
On a Mach 1 equipped with a Manual Transmission, Long Tube Headers will NOT need to be removed to pull the transmission as the Bell Housing is separate from the transmission case. With a Mach 1 equipped with a Automatic, it is definitely a little more difficult in regards to clearance and they may need removed. Ground clearance will not be affected drastically. These headers are designed to follow the path the the OE exhaust runs. The biggest difference will be the increase in pipe diameter, because of that, the exhaust may be 1/4-1/2" lower then stock.
Answered by: CJPP Dave
Date published: 2015-10-12
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Product Video

ARH Long Tube Headers 1-3/4" With Catted X-Pipe 2-1/2" Stainless Steel Cobra/Mach 1 1999-2004 Video Transcript
By Bill Tumas: If you're like me, you're always looking for ways to make more power out of your Mustang. We get a lot of customers that have the basic bolts on, such as a tune, cold air kit, and pulleys, but are looking to something more involved to take their car to the next level. For years, hot-rodders have always looked at headers as a good way to make power. With the modern Mustangs, that's no different.

Today we're going to take a look at the American Racing Headers. We've been installing a lot of American Racing Headers in the shop lately, and with good reason. We put a set in our 2013 Gotta Have It Race car and picked up over 30 horsepower at the tires with no additional changes. American Racing offers headers for all '99 and up Mustangs in varying sizes, from 1-5/8, all the way up 2 inch primary tubes for your race versions, making over a thousand horsepower.

All sizes of American Racing Headers are all going to come with this 3/8 inch flange. It's laser cut and fits well enough in certain applications, it doesn't even require a gasket. The kits are going to come with a matching 2 1/2 or 3 inch X-pipe. Welded on bungs for your O2 sensors and they're available with or without catalytic converters. If you opt to go with converters, American Racing offers this nice small efficient catalytic converter. The inside is a 200 cell metallic substrate allowing high flow while still keeping you legal.

Let's take a closer look at the header. This particular header is going to fit your 2011 and up 5.0 liter Mustangs. If you take a look, you can see how smooth the transition is between your flange and the primary. In this particular header, all your primaries are equal length and 1-7/8 inches in diameter, flowing downward to a merge style collector with a scavenger's spike built inside to produce the most power and torque. Here you can get a better look at the merge collector itself with the scavenger's spike in the middle to separate the exhaust coming through it. American Racing provides everything you need for high quality installation including bolts, oxygen extension harnesses, as well as an online forum where you can ask technical questions or show off your installation once you're finished.

We have our 2013 Gotta Have It Race car up on the lift, so we can show you how well the American Racing Headers fit. If you look, there's plenty of space between the header and the frame, while still keeping plenty of room in the center allowing you to remove your transmission without having to remove the header. It's plenty of space around our starter and the steering shaft, which can be an issue with other headers, has enough space that I can even get my hand between the shaft and the header. It's plenty of room, plenty of clearance, excellent fitting header.

American Racing Headers provided us with a set of their 1-7/8 primary headers with a 3 inch off-road X-pipe for our CJ racecar. Since the car is not for street use and is mainly for drag racing, we do not need the catalytic converters and wanted the additional power and sound that comes with deleting the cats. The overall tone is very aggressive. With quality components, excellent fitment, solid power gains and an aggressive tone, you can't go wrong with a set of American Racing Headers for your Mustang.