• WORLDWIDE DELIVERY
0 Cart

Your cart is currently empty.

Continue shopping
Total: $0.00
View cart
Check out
Wish Lists
Toggle menu
0
Black Friday Sale : Use code Black25 UP TO 15% off most of the brands! Offer ends : 11/30/2025
×
  • Home
  • MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless
MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless
MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless
MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless
MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless
Click to zoom in
Load image into Gallery viewer, MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless
Load image into Gallery viewer, MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless
Load image into Gallery viewer, MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless
Load image into Gallery viewer, MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless

Have Questions? We are here to help

support@euroklasse.com Ask an Experts

  • Guaranteed Fitment

    Always the correct part

  • In-House Experts

    We know our products

  • Added Value

    Warranties available

  • Wordwide Delivery

    We ship all over the world

MAD BMW B58 2025+ Gen 3 M340 M440 Fat Boy 5.0" Downpipe Catless

EuroKlasse INC
MAD-127
$279.00
$279.00
customers are viewing this product
Description

Upgrade your 2025+ BMW M340 M440 with the MAD BMW B58 Gen 3 "Fat Boy" 5.0" Catless Downpipe—the ultimate performance upgrade designed to unleash the full potential of your engine. Crafted from premium-quality 304 stainless steel, this larger-diameter 5.0-inch downpipe offers superior airflow, delivering enhanced horsepower, quicker turbo response, and noticeable torque gains.

The increased diameter of the "Fat Boy" downpipe sets it apart from our standard catless models by providing a deeper, richer, and significantly more aggressive exhaust tone. Precision-engineered welds and exceptional craftsmanship ensure perfect fitment, durability, and peak performance for enthusiasts demanding maximum results.

Transform your BMW M340's driving experience by choosing MAD's top-tier downpipe, designed specifically for drivers seeking ultimate airflow and a sound profile that commands attention.

Features:

  • Premium 304 stainless steel for superior durability

  • Expanded 5.0-inch diameter for unmatched airflow and performance

  • Deeper, richer, and more aggressive exhaust tone

  • Improved horsepower and torque compared to standard catless downpipes

  • Precision craftsmanship and perfect bolt-on fitment

  • Ideal for high-performance builds and enthusiasts seeking maximum results

Fitment:

Does not fit euro models (check downpipe flange design before ordering)

2025+ BMW M340

2025+ BMW M440

2025+ BMW X3 G45 M50

2025+ BMW X4 G46 M50

 

Emissions Disclaimer:
This product is not legal for sale or use on pollution-controlled vehicles operated on public roads, highways, or streets. It is intended for off-road, race, or closed-course competition use only, where such modifications are permitted.

By purchasing this product, you acknowledge and agree that:

  • You are responsible for compliance with all applicable emissions laws and regulations.

  • MAD and its affiliates disclaim any liability for improper or unlawful use of this product.

  • Use of this part on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state laws.

Please check your local laws before purchase and installation.

Read More
Read Less
We have a 10-day return policy, which means you have 10 days after receiving your item to request a return. Any return or cancellation will be 10% Fee. To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. To start a return, you can contact us at support@euroklasse.com. If your return is accepted, Items sent back to us without first requesting a return will not be accepted. You can always contact us for any return question at support@euroklasse.com. Damages and issues Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right. Exceptions / non-returnable items Certain types of items cannot be returned, like perishable goods, custom products (such as special orders or personalized items), We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item. Unfortunately, we cannot accept returns on Sale/ Discounted items or gift cards Or . Exchanges The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item. Refunds We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.

Customer Reviews

Be the first to write a review
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
The cookie settings on this website are set to 'allow all cookies' to give you the very best experience. Please click Accept Cookies to continue to use the site.
Accept Cookies privacy policy

Your cart

×