SKU: 23173764262

Active Autowerke Downpipe w/ AFlow Cat - 2016+ B58 Gen 1 & Gen 2

Sale price$765.00 Regular price$850.00
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Description

Active Autowerke Downpipe w/ AFlow Cat - 2016+ B58 Gen 1 & Gen 2Active Autowerke BMW B58 Catted Downpipe now includes turbo flange gasket NOTE: Fitment applies to US model cars only unless specifically stated. We cannot guarantee fitment to non US model cars. BMW introduced a new valvetronic, single turbo version of its direct injection engine for the later F Chassis models beginning in 2016 and carried over to the G chassis models. The Active Autowerke B58 downpipe for the M340i and M440i helps unleash some of

Active Autowerke BMW B58 Catted Downpipe - now includes turbo flange gasket

NOTE: Fitment applies to US model cars only unless specifically stated. We cannot guarantee fitment to non-US model cars.

BMW introduced a new valvetronic, single turbo version of its direct-injection engine for the later F-Chassis models beginning in 2016 and carried over to the G-chassis models. The Active Autowerke B58 downpipe for the M340i and M440i helps unleash some of the potential that is restricted by the OEM downpipe.

Turbochargers are powered by spent exhaust gases created during the combustion process. The quicker these gases are evacuated, the better. Unfortunately, the factory down pipe in the B58 is quite restrictive, which results in slower exhaust gases and slower turbo spool.

The Active Autowerke B58 Signature down pipe utilizes 4.5 diameter stainless steel piping in order to provide more power, quicker spool, and extreme durability. It then tapers down to 3.5" where we've incorporated a stainless flex joint and then down to 80mm to meet the OEM exhaust system. We never drop the diameter less than the stock diameter of 80mm. 

This variant includes a 4.5" Active Aflow catalytic converter that will NOT produce a CEL for cat efficiency guaranteed by Active Autowerke (full replacement within first two years of ownership).

The Active Aflow super high output catalytic converter features full 304 stainless steel construction, including the substrate. Active Aflow Catalytic Converters are EPA registered and compliant in 49 states and fully OBD2 compliant, perfect for use on 1996 and newer vehicles. Active's proprietary precious metal loading technology ensures greatly reduced emissions, eliminating most "Check Engine Lights" due to cat efficiency errors. These high flow catalytic converters outperform stock converters and provide a reliable solution to the most common catalytic converter problems.

The Active Aflow Catalytic Converters are rated for engines putting out up to 800 horsepower while maintaining a high flow capacity. The reduced back-pressure from this high flow catalytic converter will allow you to maximize your engines horsepower without the harmful emissions. Say goodbye to Check Engine Lights for cat efficiency and failed emissions tests!

Please Note: These catalytic converters are not legal for use on vehicles registered in the state of California as a result of California Vehicle Code Section 27156 and 38391.


NOTE: Federal law prohibits the tampering of an emissions control device. Mobile Source Enforcement Memorandum 1A, allows for aftermarket parts to be used in the repair or replacement of emissions control systems, provided the emissions aren't adversely affected. There is no mention or reference to cell density or converter volume dimension. The Active Aflow catalytic converter will produce emissions that will meet the standards set by the EPA, not CARB.

Features:

  • NO CEL for catalytic efficiency when using this downpipe

  • Active EPA registered high flow and fully OBD2 compliant

  • Casted upper stainless steel V-Band for precise fitment

  • 4.50" diameter piping allows for maximum power output

  • Quicker turbo spool

  • Rated for up to 800 hp applications 

  • Withstands up to 1500 F

  • Can reach operational efficiency within 9 seconds of startup

  • Easily bolts-on no cutting or welding required

  • Durable construction from TIG welded 304 stainless steel

  • Precise fitment

  • Ultra high flow 400 cell per square inch catalyst

  • EPA compliant for use on OBD2 vehicles (1996 and newer) except in California

  • 304 stainless steel substrate is furnace braised to the mantle for outstanding durability

  • Active proprietary precious metal loading technology ensures greatly reduced emissions

  • Ideal for Forced Induction Applications with no loss of HP

  • Both passengers and drivers are safe from harmful emissions and noise

  • Covered by 5 Year / 50,000 Mile Warranty (on shell and tube ends) and 2 year / 25,000 Mile Warranty on the Catalytic core to original purchaser only - NOTE: warranty will be null and void if your car has excessive burble (greater than stock) as that physically destroys the catalytic core

  • Made in Miami, Florida

Active Autowerke B58 Signature Downpipe Benefits

The speed of a turbo's impeller wheel is limited by exhaust back pressure. A larger down pipe relieves some of this pressure, resulting in quicker and more efficient spool. With Active Autowerke's Signature downpipe, your B58 can rev quicker, and deliver more horsepower and torque.

Minimizing back pressure while retaining daily drive-ability was the goal of our B58 downpipe. Owners can now upgrade to a product that is affordable, reliable, and easy to install.

After months of research and development, our engineers settled on a 4.5 diameter pipe which utilizes the least number of bends possible. The large volume helps the turbo spool as quickly as possible by eliminating back pressure during spool up. We are ushering in a new era in performance where we maintain air control standards without significant losses in power by using the Active super high output catalytic converter in our signature downpipe.

Constructed entirely from 304 stainless steel with 1.5MM wall thickness, we are confident that you'll be pleased with how robust and durable this down pipe is. Trouble-free installation and a long lifespan ensure that you'll enjoy many miles of performance with your B58!

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: 23173764262

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4.5 ★★★★★
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Product Reviews
C
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Chris Schenkel
Carnegie, US
★★★★★ 4
Almost Indestructable.
Style: Squirrel
We have an aggressive chewer that has yet to be able to crack this one open.  It's so indestructible that ours gives up on it and only plays with it infrequently. So the minus 1 star is more about the dogs preference, maybe.  But make no mistake, this is made better than any other toy I have ever seen.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 26, 2025
D
Verified Purchase
Dean L
Phoenix, US
★★★★★ 5
Fun toy for the dog
Style: Squirrel
This is a hit with our dog.  We have a schipperke who is very active and we play tug of war with “duck” every morning.  It has held up amazingly well despite his sharp teeth.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 16, 2025
A
Verified Purchase
AJ'sMina
Houston, US
★★★★★ 1
“ Not easy to destroy”. My arse!
Style: Squirrel, Style: Squirrel
Description says not easy for aggressive chewers to destroy. Well, my non aggressive chewer had in destroyed in less than 24 hours. Notice the lack of feet. Think I can get a refund?
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Reviewed in the United States on November 5, 2025
A
Verified Purchase
ALL THE STUFFS!
Lowell, US
★★★★★ 3
My T-Rex Killed It
Style: Squirrel
This toy would likely be fine with dogs who don't immediately destroy toys. I have a small 15lb dog that I refer to as a T-Rex. We did not use it as a tug toy and it was taken away most of the time he wasn't playing with it, but I forgot about it for 5-10 minutes and it was torn apart. My dog does not get 'regular' toys any more. They have to be the toys marked for 'aggressive' chewers. Some GoDog toys have been good, and he has received the Bark Box toys for aggressive chewers, but Bark Box toys for aggressive chewers seem to only come in larger sizes if your dog is an aggressive chewer and a lot of the toys are too heavy and large (mouth size) for him play with very much.
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Reviewed in the United States on January 4, 2025
C
Verified Purchase
C. Reynolds
Birmingham, US
★★★★★ 5
Sturdy: Westie tries to destroy it, but it has held up
Style: Squirrel
Because it's not a stuffed animal toy, there is not the issue with the stuffing getting torn out. Squeakers at head and tail. Dog loves it. Had fun lightly tying it onto fishing line, putting on the roof using the fishing pole, and yanking it off when the dog isn't expecting. He loves it and goes mad trying to, well, exterminate the varmint! Key is lightly tying to fishing line using a loop so it comes off (most of the time) when the dog shakes it violently. Short vid of how it comes off the roof. No dog in video because couldn't manage fishing pole, camera, and dog at same time. Have put it in bushes, low tree branches, flat in the yard...just start reeling in and the fun begins.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 21, 2024

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