SKU: 18644761712

MAD BMW S58 3.5" Fat Boy Downpipes M2 M3 M4 G87 G80 G82 G83

Sale price$135.45 Regular price$150.50
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Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Aug 7 - Aug 12

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Description

MAD BMW S58 3.5" Fat Boy Downpipes M2 M3 M4 G87 G80 G82 G83The MAD 3. 5" S58 Fat boy is the largest BMW S58 catless downpipe on the market! Upgrade from the stock S58 downpipes to the MAD 3. 5" Fat Boy S58 catless downpipes for maximum airflow, power, and sound! Upgrade to the MAD BMW 3. 5" Fat Boy S58 downpipes to eliminate the backpressure caused by your stock catalytic converters. By upgrading to our downpipes, your turbos can now spool faster and achieve maximum power. As a bonus, your car will sound a

The MAD 3.5" S58 Fat boy is the largest BMW S58 catless downpipe on the market!

Upgrade from the stock S58 downpipes to the MAD 3.5" Fat Boy  S58 catless downpipes for maximum airflow, power, and sound!

Upgrade to the MAD BMW 3.5" Fat Boy  S58 downpipes to eliminate the backpressure caused by your stock catalytic converters. By upgrading to our downpipes, your turbos can now spool faster and achieve maximum power. As a bonus, your car will sound a lot nicer as well.

Expect up to a 30HP increase on a tuned BMW S58 with stock turbos, even more on cars with upgraded turbos.

The flex pipe Section will help reduce the stress and unwanted vibration from the downpipes.

Features:

  • Largest 3.5'' Diameter piping compared to standard 3''
  • 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:

  • 2021+ BMW M3 G80
  • 2021+ BMW M4 G82 G83
  • 2023+ BMW M2 G87
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: 18644761712

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Ralph J
Birmingham, US
★★★★★ 5
Perfect casual Friday shoe with great comfort and style
Size: 10, Color: Optic White/Egret
These have quickly become my go-to shoes for casual Fridays at work. The fit is true to size, and they’re both comfortable and stylish without trying too hard. They pair really well with jeans or khakis, so they’re easy to dress up or down depending on the day.
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Reviewed in the United States on April 21, 2026
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GTC
Massapequa, US
★★★★★ 5
Great shoe
Size: 8, Color: British Tan
My teen loves these shoes. They have a nice contemporary styling and he says they are comfortable. Recommend.
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Reviewed in the United States on May 17, 2026
A
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Adel
Draper, US
★★★★★ 5
Good fit and looks great
Size: 11.5 Wide, Color: British Tan
Good quality and looks great, the only complaint is the lace is a bit short But size is good and color is perfect too.
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Reviewed in the United States on April 30, 2026
R
Verified Purchase
rogun
Grantham, US
★★★★★ 4
Narrow and small
Size: 10.5, Color: Black/City Skyline/Egret
I mostly chose these due to the foam rubber soles, as I was looking for a more comfortable sneaker. They are more comfortable and the quality looks decent, too, although I wish the leather wasn't so shiny. The fit is quite narrow, and while they're okay for my narrow feet, I still wonder if the wider fit would have been better. This is my 2nd pair of Cole Haan sneakers and the first were too small. So this time I ordered the next size up and the fit is not much different, so I'd say they run small all around. Despite that, they're big enough and are still quite comfortable. Finally, the laces are too short. This is probably by design, so they're not dangling around, but I find them difficult to tie. They're nice, waxed laces, but they just need to be long enough to work with.
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Reviewed in the United States on January 21, 2025
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Mrs. M
Cuba, US
★★★★★ 5
Stylish and Comfortable
Size: 12, Color: British Tan
Young professional son loves them! They are very comfortable and stylish. They fit well with the new "business attire" standards and work well for going from work day to evening social.
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Reviewed in the United States on May 7, 2026

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