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**3staxontheradio** · 05-23-2026, 07:51 PM

Talking about port shape and not primaries but literally exactly what I was drawing out for non circular cross sections in bends and opening up the inner radius CSA to manage air speed:

https://youtu.be/C2n3ywS8ce8?si=Uj6QzzZf9t1Allms

**Abrajam** · 05-24-2026, 06:55 PM

Super curious how these will sound once the final product is made. Brysons mullet tune is legit so I imagine once the headers are made, they’ll be just as spectacular. Convinced 3 of my friends to get his tune and they absolutely love it. Would love to try the headers on my dinan s3-r. If a test dummy is needed, I volunteer as tribute 😂

**Casa de Mesa** · 05-25-2026, 02:08 AM

Originally posted by Abrajam View Post

Brysons mullet tune is legit so I imagine once the headers are made, they’ll be just as spectacular.

+1! Really enjoying his dichotomy tune!

**freebird** · 05-26-2026, 05:55 AM

Question, do stepped headers help mainly by improving scavanging, or from reducing reversion?

**BTB** · 06-13-2026, 04:57 AM

I haven't seen a lot of talk about AHR headers/section 1. Any thoughts on this? I too am interested primarily in getting that smoothed out, screaming exhaust note. Currently have SGT headers/section 1, Rogue section 2 with dump valve and stock muffler. Wondering if I can maintain stock muffler and still improve sound whether dump valve is open or full closed

BMW E46 M3 Long System

https://americanracingheaders.com/collections/bmw/products/bmw-e46-m3-long-system?variant=41948375428

There is simply nothing currently offered as a package that provides the incredible HP, torque and sound as an ARH full system for your E46 BMW M3. This system features American Racing Headers patented rotational firing, 6 into 1 long tube header system for the E46 S54 powered M3.The Long System is a direct bolt-in to

**freebird** · 06-13-2026, 05:45 AM

I'd be skeptical. The ARH's aren't equal length primaries, and a 6-1 merge seems like that would complicate the fact they're not equal length?

**0-60motorsports** · 06-13-2026, 12:57 PM

So cool:

Tom Nelson on Instagram: "I always say it’s like the Wild West in the automotive industry these days. Here’s a perfect example of somebody clear across the world sending us a 3D scan of their engine bay. We designed a custom set of stainless headers around the scan, sent the file off to the “stainless toaster oven,” and bam — one-piece 3D-printed stainless headers custom fit to a customer’s car on the other side of the planet. Pretty wild when you think about it. No traditional mockup car here, no shipping test parts back and forth across the world — just digital engineering, 3D scanning, and metal printing coming together to create a truly custom set of headers. #AreyoureadytobepoweredbyNRE #NelsonRacingEngines"

https://www.instagram.com/reel/DYVyd_wJpao/?igsh=MWp6ZjB1YmZjN2VrYw==

35K likes, 867 comments - nelsonracingengines on May 14, 2026: "I always say it’s like the Wild West in the automotive industry these days. Here’s a perfect example of somebody clear across the world sending us a 3D scan of their engine bay. We designed a custom set of stainless headers around the scan, sent the file off to the “stainless toaster oven,” and bam — one-piece 3D-printed stainless headers custom fit to a customer’s car on the other side of the planet. Pretty wild when you think about it. No traditional mockup car here, no shipping test parts back and forth across the world — just digital engineering, 3D scanning, and metal printing coming together to create a truly custom set of headers. #AreyoureadytobepoweredbyNRE #NelsonRacingEngines".

**freebird** · 06-13-2026, 01:29 PM

Yes!

**George Hill** · 06-13-2026, 06:20 PM

Originally posted by BTB View Post

I haven't seen a lot of talk about AHR headers/section 1. Any thoughts on this?

6-1 headers/exhaust are pretty much known for making a great sound at the expense of torque and generally not much (if at all) hp increase.

**freebird** · 06-14-2026, 02:21 AM

Originally posted by George Hill View Post

6-1 headers/exhaust are pretty much known for making a great sound at the expense of torque and generally not much (if at all) hp increase.

Make sense from what I've read, and the little bit of exhaust modeling and tuning I've been doing for my S54. The location of the secondary (2-1) merge has a big impact on the torque curve.

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S54 Header Design talk

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