SKU: 10775718870

MAD BMW Toyota B58 Fat Boy 5" Catless Downpipe M240 340 440 Supra

Sale price$200.97 Regular price$223.30
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  • CAN

Ships within 48 hours · Estimated delivery Aug 19 - Aug 24

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Description

MAD BMW Toyota B58 Fat Boy 5" Catless Downpipe M240 340 440 SupraMeet the MAD B58 Fat Boy 5'' catless downpipe. The MAD 5 inch Catless B58 Downpipe is a high performance aftermarket upgrade for BMW B58 engine vehicles, designed to increase power and torque while improving exhaust flow. This downpipe is made from premium quality stainless steel and is precision engineered to fit perfectly with the stock exhaust system, ensuring a seamless installation process. With a 5 inch diameter, this downpipe provides

 

Meet the MAD B58 Fat Boy 5'' catless downpipe.

The MAD 5 inch Catless B58 Downpipe is a high-performance aftermarket upgrade for BMW B58 engine vehicles, designed to increase power and torque while improving exhaust flow. This downpipe is made from premium quality stainless steel and is precision-engineered to fit perfectly with the stock exhaust system, ensuring a seamless installation process.

With a 5 inch diameter, this downpipe provides unrestricted exhaust flow, which reduces backpressure and increases horsepower and torque output. It also features a catless design, which eliminates the factory catalytic converter for even more performance gains. This makes it an ideal choice for car enthusiasts who are looking to improve the performance and sound of their BMW B58 engine vehicles.

The MAD 5 inch Catless B58 Downpipe is designed to withstand the high temperatures and pressures of high-performance driving, ensuring reliable performance for years to come. 

Installation of the MAD 5 inch Catless B58 Downpipe is straightforward and can be completed with basic hand tools.

Overall, if you're looking to improve the performance and sound of your BMW B58 engine vehicle, the MAD 5 inch Catless B58 Downpipe is a must-have upgrade. It delivers significant performance gains while also adding a much needed sound improvment.

Expect up to a 30HP increase on a tuned BMW / Toyota Supra B58 with stock turbo, even more on cars with upgraded turbo.

 

Features:

  • Compatible with right-hand drive and left-hand drive vehicles
  • Smooth bends for maximum airflow without any drone
  • Up to 30HP increase on the stock turbos, even more on upgraded turbos
  • Lifetime warranty on defects and fitment
  • 90 day return period
  • All orders ship in 1-2 business days
  • Spot on fitment
  • Flex section

 

Fitment:

  • 2015+ BMW M240i & Xdrive
  • 2016-2019 BMW 340i & Xdrive
  • 2016+ BMW 440i & Xdrive
  • 2016+ BMW 540i & Xdrive
  • 2016+ BMW 740i & Xdrive
  • 2017-2020 X3 M40
  • 2017-2020 X4 M40
  • 2019+ Toyota Supra 3.0L
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 10775718870

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4.2 ★★★★★
Based on 6 reviews
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A
Verified Purchase
Amazon Customer
San Leandro, US
★★★★★ 5
good quality
Color: Black, Size: without USB
good quality
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026
M
Verified Purchase
Meghan C.
Massapequa, US
★★★★★ 1
BUYER BEWARE!! ITS GARBAGE YOU WOULD BE BETTER BUYING A $20 MONITOR MOUNT INSTEAD
Color: Black, Size: without USB, Color: Black, Size: without USB
This is the second review I ever gave on Amazon out of thousands of items I bought over the years.. This is the worst monitor mount I ever bought I have purchased maybe ten over a long period of time this monitor mount isn't the cheapest so you would think your getting quality your not it's garbage worse than garbage because it can break your monitor mine decided to give out and slam down thankfully it didn't break my $1100 oled monitor also it has weird screws you have to screw in to get it to rotate 360 degrees it has a screw that clamps down on your desk and will leave a mark and damage it.. To lower it you have to turn it 500 times loosen it up and it never feels stable also the tilt feature is litterally the worst no matter how high you try to level your monitor it always hangs downwards I have a light monitor well within the weight capacity.. I would buy any other monitor mount so buyer beware if you want junk and waste your time fiddling and trying to get this in a good position you won't and it will just get you super aggravated I wish I could give this item zero stars
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 15, 2026
J
Verified Purchase
Jaqueline
New York, US
★★★★★ 5
Worth the price an pretty good angles
Color: White, Size: without USB
So I decided to get this monitor arm because I was trying to go for an all white aesthetic and needed a arm to come in on time was a little skeptical because of the reviews but after using it, I love it. It’s super sturdy. The monitor arm is pretty high-quality. It uses mostly metal and the cable management is really good. I definitely recommend it.
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Reviewed in the United States on January 18, 2026
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Verified Purchase
LucyF
Waukegan, US
★★★★★ 4
Feedback
Color: White, Size: without USB
I wish you didn’t have to adjust screws to adjust position Otherwise it is great
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Reviewed in the United States on November 5, 2025
J
Verified Purchase
Jefferson T
Los Angeles, US
★★★★★ 5
Easy to use
Color: Black, Size: without USB
Easy to use and set up. The quality of the item seems to be there - sturdy enough to hold my 34” ultra wide Samsung monitor. Worth every cent with how easy it is to use and readjust the angle of the screen - I had to stiffen the resistance to account for the added weight of the monitor, but the fit and stability is spot on once the adjustment was made; just a few turns of the screw with the included Allen key
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Reviewed in the United States on October 26, 2025

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