SKU: 23173764262

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

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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
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  • Except Preorder products are shipped in 48 hours.
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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]
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SKU: 23173764262

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Product Reviews
S
Sydney
Louisville, US
★★★★★ 5
Two romances for the price of one!!
Format: Kindle
This was a really interesting book. Usually you only get a single romance, maybe some side character has a little something happen offpage. Not here. You get two complete romances for the price of one. Though the romances are interconnected and somewhat similar. Both Eleanor and Tatum don't believe they should have relationships...though for very different reasons. And they both overcome their fears and move forward with their love interests in similar fashion. Dawn was by far the best side character, and I loved her. I would honestly love to have a story of her finding love again, even at her age. She's just so fun. Eleanor and Carson are a fun pair. They bring out the fun and playful in her. She brings out the emotional depth in them. They really do make each other better, more complete people. They become close very quickly which ends up scaring Eleanor off. Tatum and June are adorable. They both obviously like each other, but Tatum is hung up on the idea that nothing will ever work because of how her family is, and June is trying to deal with being the kind of person who needs a relationship to feel safe and normal. They finally start to open up to each other and then mutually freak out a little causing hurt feelings. There is a third act breakup for each couple. They happen about the same time, and last for the same time in the book and chronologically which is a few months unfortunately. Overall it was a very light, fluffy story that is easy to fall into. There aren't really any truly explicit spicy scenes. There is the barest amount of spice and then it gets glossed over, so not truly fade to black either. I wasn't a fan of the whole 'NYC is so super fabulous and everyone should want to live there' kind of vibe parts of the book gave off, but that's more of a personal hangup of mine than anything else.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2025
P
Patti M
Lexington, US
★★★★★ 4
Feeling The Holiday inspiration
Format: Kindle, Format: Kindle
Tatum needs a quick escape from her small town life and the week of events planned to introduce her (and the rest of the family) to a surprise half brother, so she joins customer-who-she-won’t-let-herself-love June on a business trip to NYC Tatum is swapping homes with Eleanor, who needs an escape of her own from The City after of PR nightmare of a job - and situationship - loss throws her life into chaos. While she’s staying at Tatum’s, she meets her younger sibling and her attraction to them is both immediate and required. But are there feelings too? I think with any story that involves multiple relationships, you’re going to be interested in one over the other. For me, I was invested more in Eleanor and Carson. Their spontaneity and artistic sides of their jobs seemed to mesh well from the start. I’m still not sold on why Tatum and June shouldn’t have been together from the start, so it felt like I was waiting for them to catch up. My favorite side character would have to be aging former movie star Dawn, from Tatum and June’s storyline. I was cheering for her to get a second chance at the spotlight. I was happy for HEAs all around, especially when the couples have to overcome the issues of having existing lives in different places. I enjoy books like this when there’s an epilogue set later too, assuring those HEAs stick the landing!
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Reviewed in the United States on June 5, 2025
M
Momlovestoread reviews
Phoenix, US
★★★★★ 5
Entertaining
Format: Kindle
This is a fun book that includes a house swap such as you have seen in the movie Holiday. Tatum and Eleanor both go through things personally and need a change so they switch houses which are in different towns. One goes to a small town, whereas one is in the Hollywood area. It’s really fun to see how both characters adjust to being in different places and how it really makes them think about their own lives while they each by themselves falling for someone. There is wonderful banter throughout the book and all of the side characters are entertaining as well. It’s a fun book.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2025
V
ValeriS29
Lowell, US
★★★★★ 3
Not for me
Format: Paperback
I’ll start off by saying I’m definitely not the target audience for this book yet I tried not to let that color my review any. The dual main characters are interesting in their own ways yet I didn’t find myself invested in the outcome.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2025
S
Scrappy Rat Reviews
Lexington, US
★★★★★ 4
The Holliday but make it sapphic
Format: Paperback
Ok, sapphic twist on The Holiday was just what I needed. I loved all the sweet little details between the couples and all the family drama. June and Tatum swap homes with Eleanor and leave their small town for a big adventure in New York, hoping to sell June's perfume business. Tatum needs to escape her family, and wouldn't you know it, she has always had a huge crush on June. Eleanor needs to get out of New York stat when she finds out her fling is actually engaged, she gets fired from her job, and she is just an all-around mess. She jumps at the chance to swap homes and for a girl with a lot of romantic issues, meeting Tatum's sibling Carson is quite the distraction. In New York, Eleanor's neighbor Dawn is an old famous actress, and she was one of my favorite characters. She was full of life but needed to be reminded how much of a badass she is. June and Tatum are able to get her to be social while she forces them to evaluate what is holding them back. My second favorite character is Carson. The romance between them and Eleanor was so swoony, and I felt like they are the kind of person you want to orbit because being near them would make you happy. I think them as a couple was the best part of the book, and the way Eleanor gets to join in on the crazy family reunion Tatum has to skip out on. Tatum was probably the hardest character for me to love. They felt extremely juvenile for their age, and I kept thinking she was 18-20, only to be reminded she was an adult almost in their 30s. I also felt a little less invested in her love story with June and while I liked them both fine, Carson and Eleanor were top tier for me. If you are looking for a romcom with heart, this one will check those boxes.
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Reviewed in the United States on May 11, 2025

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