ARH Long Tube Headers | Available from NEMESISUK.COM

ARH 1-3/4" x 3" Long Tube Headers With Cats for LHD Mustang 5.0L GT 2015-23 | #MTC5-15134300DCWC

SKU: MTC5-15134300DCWC
Availability: In Stock
Please hurry! Only 1 left in stock

Free UK Shipping On Orders Over £150

Terms and Conditions apply

Buy Now Pay Later

Plan. Buy. Pay in 3 with PayPal pay later

Check Product Availability

You’re welcome to get in touch for estimated lead times on any of our products before completing your order.

'Out Of Stock' Lead Times

Our typical lead time for the majority of 'Out of stock' parts is 10-14 business days, subject to availability from the manufacturer. Orders will be despatched as soon as all items become available.

Get Expert Advice

Unlock the full potential of your vehicle with Nemesis UK. Get expert advice from our team including guidance on fitting and recommended installers.

Get Expert Advice

Long Tube Exhaust Headers
Direct Connection System 
1-3/4" x 3" with Catalytic Converters
for LHD Ford Mustang 5.0L GT 2015-23 
Manufactured by American Racing Headers | Part #MTC5-15134300DCWC

The latest generation of Mustangs brought performance and handling to a whole new level, but power and torque as still waiting to be unleashed from an anaemic factory exhaust.


With ARH header systems in 1-3/4" and 3" Direct Connect Kit with Catalytic Converters unlocks that power with performance gains up to 30 RWHP.

What's more, they're designed to work for stock Catback systems, without any cutting or welding.

IMPORTANT: American Racing Headers Exhaust Systems are for OFF-ROAD use only.


  • 1-3/4" Long Tube Headers with Standard Catalytic Converters.
  • Capable of withstanding up to 1500 deg F
  • Ideal for forced induction applications, with no loss of HP
  • 100% Made in the USA - Never Outsourced
  • Made entirely of 304 stainless steel
  • 3/8" 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 complete with welded scavenger spikes
  • Catted systems feature 200 cell metallic substrate catalytic converters for extreme durability


Euro Emissions Standards:

*As ARH catalytic converters are designed primarily for the US market, they are not officially tested to Euro Emissions standards. However, ARH have tested a large variety of catalytic converters. Through their own testing, with local garages and test laborities, ARH have established their catalytic converters perform equally as well as the Euro Type Approved catalytic converter equivalents.
Please note. These are Non-Type approved catalytic converters. It is therefore, “ILLEGAL

Warranty Information:

The manufacturers catalytic converter warranty covers the construction of the catalytic converter, and does not cover against emissions testing. Vehicles running healthily that are not  running too lean or rich should pass an emissions test with ARH catalytic converters installed without issue, but this is not a guarantee. The warranty covers failure of the catalytic converter. Should the catalytic converter fail, please contact us to discuss your options.

Why Choose Nemesis UK?

Nemesis UK sell only genuine parts and are honoured to be the top distributor for ARH products in the UK. Please be aware of other online retailers selling copycat versions of ARH products with similar part numbers. These are not manufactured to the same standards as ARH catalytic converters. These will have a lower weight of precious metals in their construction.

Our warehouse holds the UK's largest stock of direct-fit exhausts, universal mufflers and catalytic converters, offering next-day despatch on 100s of parts.



Why choose American Racing Headers?

American Racing Headers is the leader in high quality and high-performance header and exhaust systems. Made entirely in the USA with US sourced materials, you can rest assured knowing that ARH quality comes second to none.

Attention to detail drives every stage of their process, from prototyping to production. ARH exhaust systems have been race proven time and time again with championships to show it!

Vehicle Application:

  • Left Hand Drive Ford Mustang 5.0L GT 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023
  • *These will fit 2018+ Facelift Applications but will remove the GPF / Gas Particulate Filter. Custom tuning / programming will also be required. Requires O2 sensor looms to be extended due to the different plug connections on later 2018+ Facelift models.

If you are in the market for a Cat-back as well please speak to us for advice.

Ordering is made easy with our online Checkout.

Many parts are held in stock, or available to order for delivery in 10-14 days, subject to availability from our suppliers.

Orders placed before 1pm Monday - Friday may be despatched the same day, provided ALL items in your order are in-stock (exceptions apply).

We now offer FREE UK SHIPPING on orders for parts over £150 total.

For orders under £150 or to non-UK destinations, shipping charges are applied at Checkout.

You can check costs for shipping via the Checkout:

  1. Add the item(s) to your Cart
  2. View Cart and select Checkout
  3. Enter your personal details and delivery address
  4. Shipping costs will automatically update and you can review your order total before completing payment
  5. If you wish to continue shopping, click the logo at the top of the checkout page to return to our Home page.

For orders sent outside the UK (Europe, Rest of the World)

Our website pricing usually includes UK VAT.

Once you proceed to Checkout and update your delivery address to a non-UK destination, pricing in the checkout will automatically update to exclude UK VAT.

If you continue to browse our website during this, or subsequent sessions, the pricing you will see in our online store may automatically show as excluding UK VAT due to the delivery address now stored in the Checkout.

IMPORTANT – Orders delivered outside the UK will usually be subject to additional Local Customs and Import Duties. Such charges are the responsibility of the recipient and vary from country to country. Contact your local customs office for more details.

Comprehensive information on Ordering, Shipping rates as well as Warranty and Returns plus more can be found here.

You May Also Be Interested In

Recently Viewed

Shop By Brand