[mike@x-ph.com]

The most popular downpipe just got even better! You now have the option to choose between the premium GESI catalytic converters or the more affordable Active Autowerke cats. Both options come with the same no Check Engine Light (CEL) guarantee and comprehensive warranty.



Active Autowerke B58 Catted Downpipe – Unleash Your BMW's True Potential
Enhance your BMW's performance and sound with the Active Autowerke B58 Catted Downpipe.

Key Features:
High-Flow Active Autowerke Catalytic Converter

Engineered to maximize exhaust flow while reducing emissions.
Guarantees no Check Engine Light (CEL) issues.
Comes with Active Autowerke's exclusive warranty for peace of mind.
Stainless Steel Construction

Made from premium 304 stainless steel for durability and corrosion resistance.
Precision TIG-welded for strength and longevity.
Optimized Performance

Increases horsepower and torque by reducing exhaust backpressure.
Enhances turbo spool and throttle response for a more exhilarating drive.
Improved Exhaust Note

Delivers a more aggressive and sporty sound without excessive cabin drone.
Direct Bolt-On Installation

Designed for a seamless fit with OEM mounting points.
Includes all necessary hardware and gaskets for a hassle-free installation.

Why Choose the Active Autowerke B58 Catted Downpipe?
Upgrade your BMW's exhaust system with confidence. The Active Autowerke catted downpipe is specifically designed for B58 engines, ensuring optimal compatibility and performance. Unlike other downpipes that use generic catalytic converters, this model features Active Autowerke's proprietary cat, which is engineered to prevent CEL issues while delivering maximum flow.


Active Autowerke Warranty:
Rest assured with Active Autowerke's warranty on the catalytic converter. Their commitment to quality ensures that you're getting a product that not only boosts performance but is also built to last.

Unlock Hidden Power Today
Don't let the factory downpipe hold back your BMW's true capabilities. Upgrade to the Active Autowerke B58 Catted Downpipe and experience significant gains in power, sound, and overall driving enjoyment.

[BradMX5]

So not for the S58?

[mike@x-ph.com]

Originally Posted by BradMX5

So not for the S58?

All engines, but the B58 pictures are the only ones available.

The downpipes are the same that are currently offered by Active Autowerke, but instead of the GESI cats, its going to be the Active Autowerke cats

[BradMX5]

Originally Posted by mike@x-ph.com

All engines, but the B58 pictures are the only ones available.

The downpipes are the same that are currently offered by Active Autowerke, but instead of the GESI cats, its going to be the Active Autowerke cats

Was just checking since it only talked about B58.

Thanks for clarifying!

This thing looks chonky

[mike@x-ph.com]

Originally Posted by BradMX5

Was just checking since it only talked about B58.

Thanks for clarifying!

This thing looks chonky

sorry about that, i made the thread as i was leaving the office for the weekend

[BroDoze]

Mike, do you have a link to the G87 version on your site? Searching and it’s kind of a mess of different things.

Haven’t seen the pricing, but this sounds exciting!

[mike@x-ph.com]

Originally Posted by BroDoze

Mike, do you have a link to the G87 version on your site? Searching and it’s kind of a mess of different things.

Haven’t seen the pricing, but this sounds exciting!

im not allowed to post links to products on here but search for part number 11-085 on our website

its the same listing as the M3 and M4.
under options, you can now choose between GESI and Active cats

[nola2atx]

Damn that's an expensive dp

[mike@x-ph.com]

Originally Posted by nola2atx

Damn that's an expensive dp

if you dont want a CEL, thats the best priced downpipe

[rons e92]

Do you have any data on the flow rates between the two cats? Have any longitudal studies been conducted to verify these will last and can you share that data? What's the drawback?

Thanks in advance Mike. Had AA GESI cat DPs on my G42 and my last G87 and intend to get them for my new G87 when it's delivered.

[mike@x-ph.com]

Originally Posted by rons e92

Do you have any data on the flow rates between the two cats? Have any longitudal studies been conducted to verify these will last and can you share that data? What's the drawback?

Thanks in advance Mike. Had AA GESI cat DPs on my G42 and my last G87 and intend to get them for my new G87 when it's delivered.

I do not have any data on the active cats as they are still brand new and not fully released yet.

GESI cats have a lot of data that you can find on their website

[Geighty7]

mike@x-ph.com does gesi, HJS, or just none matter if tuning?

I’m currently awaiting my ECU back on the FEMTO unlock. Will be running a stage 2 on my 6MT G87 and looking for a solid set up DP’s.

Torn between these AA’s, Evo Racewerkes, milltek (HJS), Fabspeed (also HJS) and MAD.

Wondering if after a tune, they all equal out? I’m looking for the cleanest and best performance around while not sacrificing performance and durability. I’d rather not spend a ton of money of Gesi and or HJS is only good for a no cel (hence my tune).

Thoughts?

Edit: I currently have a non- res milltek catback.

[BroDoze]

I think the Femto changes everything. You no longer care about CELs. Which means you don’t have to drop the big bucks on the few CEL-free high dollar options. Are you still wanting to run cats at all? If so, aren’t the 200 cell the least-restrictive of all of them? They also happen to be the cheapest. As long as you choose a brand that’s not going to burn up in 2 years, you’re good.

[mike@x-ph.com]

Originally Posted by Geighty7

mike@x-ph.com does gesi, HJS, or just none matter if tuning?

I’m currently awaiting my ECU back on the FEMTO unlock. Will be running a stage 2 on my 6MT G87 and looking for a solid set up DP’s.

Torn between these AA’s, Evo Racewerkes, milltek (HJS), Fabspeed (also HJS) and MAD.

Wondering if after a tune, they all equal out? I’m looking for the cleanest and best performance around while not sacrificing performance and durability. I’d rather not spend a ton of money of Gesi and or HJS is only good for a no cel (hence my tune).

Thoughts?

Edit: I currently have a non- res milltek catback.

Originally Posted by BroDoze

I think the Femto changes everything. You no longer care about CELs. Which means you don’t have to drop the big bucks on the few CEL-free high dollar options. Are you still wanting to run cats at all? If so, aren’t the 200 cell the least-restrictive of all of them? They also happen to be the cheapest. As long as you choose a brand that’s not going to burn up in 2 years, you’re good.

the flash tune hides the CEL code, it does not change emission readiness. so you would still need the active autowerke downpipe

[Geighty7]

Originally Posted by mike@x-ph.com

the flash tune hides the CEL code, it does not change emission readiness. so you would still need the active autowerke downpipe

But from a performance aspect and not an emissions standpoint, would you recommend Gesi, HJS, or something that’s neither like Evolution racewerks?

[mike@x-ph.com]

Originally Posted by Geighty7

But from a performance aspect and not an emissions standpoint, would you recommend Gesi, HJS, or something that’s neither like Evolution racewerks?

it wont matter unless you are targeting over 850 whp

[Geighty7]

Originally Posted by mike@x-ph.com

it wont matter unless you targeting over 850 whp

Thanks! Likely staying under 700hp.