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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Aug-04-2014, 04:16:46 PM   #41
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Default Re: E46 M3 Definitive Exhaust Guide

Random though. Why doesn't anyone make a sort of J-pipe for our cars to eliminate drone? I had an equation for one once but never followed up with it. Maybe it was too long of a length requirement given the drone RPM frequency.
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Old Mon, Aug-04-2014, 07:29:52 PM   #42
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Default Re: E46 M3 Definitive Exhaust Guide

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Originally Posted by gojcaj View Post
Very cool and thorough post! Thanks for taking the time to put it together. Should eventually be stickied in my opinion. Also just starting following you on IG.
Awesome!!!

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Random though. Why doesn't anyone make a sort of J-pipe for our cars to eliminate drone? I had an equation for one once but never followed up with it. Maybe it was too long of a length requirement given the drone RPM frequency.
The only J-Pipes I'm familiar are mainly for transversely mounted V-engines, where one of the pipes is required to form a J so it equates to an equal length exhaust path. What were you referring to?
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Old Mon, Aug-04-2014, 07:39:07 PM   #43
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Default Re: E46 M3 Definitive Exhaust Guide

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Awesome!!!

The only J-Pipes I'm familiar are mainly for transversely mounted V-engines, where one of the pipes is required to form a J so it equates to an equal length exhaust path. What were you referring to?
I've seen them used more often with domestic car guys. The pipes are specific lengths to accommodate drone at the required RPM using wave cancellation. Some people incorrectly call them Helmholtz tubes as well.
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Old Mon, Aug-04-2014, 07:49:20 PM   #44
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Default Re: E46 M3 Definitive Exhaust Guide

EXCELLENT thread- thank you for the your effort.
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Old Mon, Aug-04-2014, 08:42:38 PM   #45
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Default Re: E46 M3 Definitive Exhaust Guide

Wow this thread took off since I first looked at it lol.

Went back and edited my earlier post for US cats being 400cpi, several people pointed out that they are 200cpi.
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Old Mon, Aug-04-2014, 11:55:05 PM   #46
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Default Re: E46 M3 Definitive Exhaust Guide

Wow OP, lots of spare time on your hands hey? lol

Just my opinion, euro headers and cars are probably the single greatest mod for these cars, and are super cheap!

Cat delete pipes = rasp city and loud
RE El Diablo Muffler = Sounds awesome, minor drone
AP V1 Muffler = Loud and exotic, drone drone drone
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Old Tue, Aug-05-2014, 12:39:31 AM   #47
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Default Re: E46 M3 Definitive Exhaust Guide

Very comprehensive, but I can see this information overwhelming some people that are hoping to achieve a specific sound.

Further complicating matters is how big a difference minor changes can make. Take for instance my Corsa exhaust, which I listed for sale. With stock headers and section 1, it removed rasp and sounded fine (though I prefer rasp). With SS V1 and un resonated/catted section 1, it sounded awful! It had the conflict between rasp from no cats and the resonators. It wasn't too loud but sounded terrible. I couldn't wait to get rid of it.

Then I needed the stock exhaust from my convertible. So I put the Corsa on. Smaller diameter headers and OE section one... Still no cats... And it sounds great! Much better than even with stock headers. I declined a sale at my asking price because it's that good. Low but not too low. Some rasp. Louder but not too loud. Feels more powerful.

And the only difference is a slight change in diameter of the section one.

Small variables can make a huge difference. The more you can try and hear/feel, the better.
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Old Tue, Aug-05-2014, 02:22:51 AM   #48
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Default Re: E46 M3 Definitive Exhaust Guide

This is an awesome thread. Thanks for taking the time to do this!

This should be a sticky for sure!
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Old Tue, Aug-05-2014, 05:02:27 AM   #49
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Default Re: E46 M3 Definitive Exhaust Guide

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Originally Posted by Teslazerok View Post
Wow this thread took off since I first looked at it lol.

Went back and edited my earlier post for US cats being 400cpi, several people pointed out that they are 200cpi.
Updated. That's good to know our factory cats, even the US ones, are rather free flowing.

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Small variables can make a huge difference. The more you can try and hear/feel, the better.
I hear ya. Once you have picked out the general style and price range you want to spend, along with how aggressive of a sound you want, it can take 2-3 different setups to really dial in the sound you want. Or at least that's how I feel. I've been through about 8 or so different setups by now, and I'm still looking for something different.

However, I started to realize it may be an always evolving quest - which makes it so great. A few years ago, I wanted the most aggressive setup, with the least amount of rasp and drone. My objectives now have changed to a thick, solid and slightly dirty OE note with a kick. Nothing too loud and should barely pass as as acceptable for OEM.

We'll see how that pans out this round lol.
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Old Tue, Aug-05-2014, 05:15:24 AM   #50
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Default Re: E46 M3 Definitive Exhaust Guide

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I've seen them used more often with domestic car guys. The pipes are specific lengths to accommodate drone at the required RPM using wave cancellation. Some people incorrectly call them Helmholtz tubes as well.
Ah, got it! I'm not too familiar on the science behind helmholtz tubes, which I feel is the general undertone of most members here. I should read more about it, always found them interesting.
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Discussing E46 M3 Definitive Exhaust Guide in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)