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Home Exhaust American Racing Headers Late Model Ford Mustang Headers MT4-99134300LSWC
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VEGE Remanufactured Long Block Crate Engines VFZY $1,369.00
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American Racing Headers C6 Corvette Headers C6-05178300LSNC
American Racing Headers C6 Corvette Headers C6-05178300LSNC $1,412.00

American Racing Headers Late Model Ford Mustang Headers MT4-99134300LSWC

$1,322.00

Headers, Stainless Steel, Natural Finish, 3/8 in. Flanges, 1.750 in. Primary Tubes, 3.00 in. Outlet, X-Pipe, Cats, Ford, Mustang, Cobra, 4V, Pair

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Description

Overview

Brand: American Racing Headers
Manufacturer’s Part Number: MT4-99134300LSWC
Part Type: Headers
Product Line: American Racing Headers Late Model Ford Mustang Headers
Summit Racing Part Number: AMH-S00491
Header Style: Long tube one-piece
Header Material: 304 stainless steel
Primary Tube Outside Diameter (in.): 1 3/4 in.
Header Color: Natural
Flange Style: Standard
Weld-Up: No
Collector Attachment: Slip fit
Collector Diameter (in.): 3.00
Collector Reducers Included: No
Tuned: Yes
Primary Tube Gauge: 18-gauge
Flange Thickness (in.): 0.38 in.
Bolts/Studs Included: Yes
Gaskets Included: Yes
Crossover Pipe Included: Yes
Crossover Pipe Style: X-pipe
Crossover Pipe Diameter: 3.000 in.
Catalytic Converter(s) Included: Yes
Catalytic Converter Quantity: 2
Motor Mounts Included: No
Transmission Mount Included: No
Quantity: Sold as a pair.
Notes: Off-Road use only. Includes the connection pipe.

American Racing Headers Late Model Ford Mustang Headers

American Racing Headers late model Ford Mustang headers are available for a wide variety of Mustang engines and models; every set provides a serious bump in horsepower and torque. Select headers come with an X-pipe standard, if you prefer a more classic muscle-car sound, swap the X-pipe for an optional H-pipe. Either choice provides a low-rasp, drone-free driving experience.

ARH Direct Connect kits for Mustangs are designed to work with original equipment cat-back systems without any cutting or welding. For Corsa cat-back exhaust systems, check out ARH’s Direct Connect kit specifically made to work with Corsa cat-backs.

ARH Mustang headers with Bottleneck Eliminator kits do away with the 2.25 in. restriction at the cat-back connection point of some OE 5.0L systems. They are specially built to fit aftermarket cat-back systems; a simple mark and cut (no welding required) mates the ARH Bottleneck Eliminator to your cat-back.

ARH long system headers for 2012-14 Boss Mustangs even allow you to keep the Boss side pipes.

Additional features of American Racing Headers late model Ford Mustang headers include:

* 100 percent long-lasting 304 stainless steel
* 3/8 in. thick laser-cut flanges for a warp-free seal
* Hand-ported TIG-welded inlets
* Optimized primary tube routing for superior fit and performance
* Merge collectors include welded scavenger spikes
* Catted systems feature 200 cell, metallic substrate catalytic converters for extreme durability
* The only headers you should ever need to buy
* All American Racing Headers exhaust systems are for off-road use only

Shipping & Delivery
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Effective Date: August 9, 2025

At X Factors Motorsports, we are committed to delivering your order quickly, securely, and affordably.


1. Processing Time

  • Orders are typically processed within 1–2 business days after payment is confirmed.

  • Orders placed on weekends or holidays will be processed on the next business day.


2. Delivery Times

  • Domestic Shipping (United States): Delivery takes 5–7 business days from the date of shipment.

  • International Shipping: Delivery times vary by destination and may take 7–21 business days depending on customs processing and local delivery services.


3. Shipping Rates

  • United States: Free standard shipping on all orders.

  • International: Shipping costs are calculated at checkout based on the delivery address, package weight, and destination country.


4. Carriers Used

We ship orders using trusted carriers such as UPS, FedEx, USPS, and DHL to ensure reliable delivery. Tracking numbers are provided for all shipments.

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