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Your Vehicle 2018 Mercedes Benz C63 AMG Base Coupe 205.486 V8 4.0L

Audi B9 A4/A5 2.0T High Flow Catalytic Converter - (NO LONGER AVAILABLE)

Unleash up to 14 WHP with an ECS High Flow 200 Cell Catalytic Converter -- Includes complete install kit
10X Entries Into Our F80 M3 Sweepstakes
For vehicles up through 2020
ECS
Mfg Part #
025258ECS01KT 025258ECS01KT
ECS Part #
ES#3624402
Brand
ECS
Note:This product is no longer available.
Note: This product is no longer available.

Product Details

10X Entries Into Our F80 M3 Sweepstakes
For vehicles up through 2020

The perfect way to unleash hidden horsepower in a modern turbocharged engine is to upgrade the restrictive factory catalytic converter with a smoother, higher flowing unit. This is a great way to increase performance and add a nice growl to the exhaust note. Ideal performance is achieved through expelling exhaust gasses at maximum velocity through a larger internal diameter and a less-restrictive catalytic converter. We measured maximum gains of +14WHP and +13ft/lbs of torque on our Audi B9 A4 when equipped with APR Stage 1 ECU software, ECS Kohlefaser Luft-Technik Intake System and ECS Intercooler/Charge Pipe Kit. 

Through multiple design iterations and stringent product testing, we have engineered our High Flow Catalytic Converter to not only free up horsepower, but to provide trouble-free installation.  Designed and engineered in house, our High Flow Catalytic Converter utilizes only premium materials and manufacturing techniques to deliver unmatched quality and reliability. Made of exquisite brushed T304 stainless steel and precision ground 3/8" thick CNC-Cut T304 stainless steel flanges, it is sure to look great and hold up to whatever is thrown at it.  New OE gaskets, class 10.9 bolts, and copper flanged lock nuts are included for a trouble free install.  Each weld joint is hand TIG welded for precision and strength and eye-catching beauty.  The stainless steel oxygen sensor bung is TIG welded in the OE-location so no extension harness are needed. 

Our ECS Tuning High Flow Cat offers impressive real world results.  Get yours today and experience the difference!

NOTE:

  • Aftermarket ECU software is recommended to maximize performance gains as advertised.
  • This product will cause a MIL (Malfunction Indicator Lamp) on factory stock tune.
  • Not for later vehicles with V-Band turbo outlet (2021+)
  • This product is in intended for off-road use only. Not intended for states our counties where regulations prohibit its use.

Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board.

Cross Reference
  • high flow cat
  • hfc
  • 4M0254252
  • 4M0254252FX

This part does not have vehicle applications yet. For fitment verification, contact our sales team via 330-331-2003, Live Chat Text Us! , or [email protected].

Kit Contents

Description Brand Qty Lifetime
Self-Locking Nut - Priced Each Genuine Volkswagen Audi - Corporate Logo 4 YES
M8 Copper Exhaust Lock Nut - Priced Each Genuine BMW - Corporate Logo 3 YES
Exhaust Gasket Genuine Volkswagen Audi - Corporate Logo 1 YES
Type 18-8 Stainless Steel Flat Washer Bremmen Parts - Corporate Logo 3 YES
Exhaust Gasket - Priced Each Genuine Volkswagen Audi - Corporate Logo 1 YES
High Flow Cat - (NO LONGER AVAILABLE) ECS - Corporate Logo 1 YES
JIS High-Strength Steel Flanged Hex Head Screws, M8 X 1.25 Mm Thread, 30 Mm Long - Priced Each Bremmen Parts - Corporate Logo 3 YES

This Product Is Covered By Our Lifetime Replacement Program

Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.

If you have any questions, would like to learn more or are ready to place a replacement claim, click here!

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Return and Exchanges

Need to set up a return? Click here to begin: Return Process

All you need is your order number and email address.


New/Unused Product Returns

ECS Tuning will accept returns for unused products within 90 days of the ship date for a refund to the original payment method used. The customer is responsible for the return shipping costs and fees. If selecting to use a prepaid shipping label, the shipping cost will be deducted from the total refunded amount. All new/unused products must be new, unused and must be in the original packaging, including labeling, manuals, hardware, etc. Special order parts are non-refundable.

In the event that we find an error on our website or on behalf of an ECS Tuning Representative, we will provide a return shipping label from the original delivery location.

Refused Packages

Any domestic orders that are returned to ECS Tuning as refused by receiver or non-deliverable will be subject to a return handling fee and will be processed as a return in compliance with our standard return policy, including a 15% restocking fee.

Any international orders that are refused at the time of delivery will be subject to carrier abandonment of the package, at which time the ordered products would be discarded by the carrier. The customer will not be refunded for the value of the order and the discarded products are no longer retrievable.

Return Process

Return Process

ECS Tuning now offers an online returns solution! To get started, simply log into your ECS Tuning account, Click the "View Orders" button on the My Account home page and select the order that you wish to make a return on to begin. If you have any questions, feel free to reach out to our Customer Service Team for assistance!

Please note: Refunds will be processed to the original payment method used on the order or to an in store credit, respective to the type of return that is made as well as any pre-existing arrangements with an ECS Tuning Customer Service Representative. In the event that multiple forms of payment were used, we will refund the value to an in store credit. In the event that a return label is provided, these charges may be deducted from the total refund you receive.

Original shipping costs are non-refundable and the buyer is responsible for return shipping charges. ECS Tuning will not accept COD deliveries.


All in store credit balances will expire after one year from the original purchase date.

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Shipping Policy

Free Shipping On Orders $49 & Up

Items marked with a 'Free Shipping On Orders $49 and Up' logo may qualify for free standard economy ground shipping to the contiguous United States (48 states) for most orders with a value greater or equal to $49.00 USD. Oversized products and direct ship products are excluded from this offer unless otherwise noted.

Free Shipping

Items marked as 'Free Shipping' may qualify for free standard economy ground shipping to the contiguous United States (48 states). Oversized products and direct ship products are excluded from this offer unless otherwise noted.


The policies listed above are subject to change at any time without notice.

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Lifetime Replacement

Want to know more about our Lifetime Replacement program?

Click here to learn more.

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Why You Should Shop From ECS Tuning

ECS Tuning stands out as more than an automotive parts supplier-it's a vibrant community fueled by a shared passion for cars. Born from the enthusiasm of car lovers, we offer an unmatched understanding and commitment to the automotive world, providing high-quality parts and accessories sourced from our own experiences. Our selection is meticulously crafted to meet the highest standards of performance, quality, and design, catering to both the latest trends and classic styles.


Our distinct advantage lies in our passionate team and comprehensive support, offering expert advice and seamless service from selection to installation. Shopping with ECS brings exclusive perks, including our Lifetime Replacement Guarantee and free shipping on orders over $49, enhancing the value of every purchase. As a central hub for car enthusiasts, ECS Tuning fosters a rich community where ideas and experiences flourish, transforming us from a mere supplier into a platform where automotive dreams come to life.

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Cancellation Policy

At ECS Tuning, we understand that plans can change. That's why we offer a flexible cancellation policy for our customers. You may cancel your order at any time before you receive the shipment confirmation. This policy is designed to provide you with peace of mind and the flexibility to make adjustments to your purchases as needed. Should you decide to cancel your order, simply reach out to our customer service team, and we will assist you with the process swiftly and efficiently.

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Manufacturer names and/or part numbers are used only for identification purposes.

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