Aftermarket mufflers - power loss?

[bavarian3]

Soo I'm debating whether to get tips for my stock muffler or save the $ towards an aftermarket muffler. This is less of a thread about sound, but trying to learn if anyone has figures for power gains or loss due to section 3. Tough to trust manufacturer marketing.

Based on my searching here it appears:
-Dinan muffler gains hp (phony and ugly tips tho)
-Rogue el diablo loses hp

I haven't seen any reports about quality offerings such as Supersprint, Eisenmann, etc. Only people fighting about rasp and how the stock muffler is the holy grail.

Insights are appreciated.

[dl.m3]

Basically using the Dinan and the El diablo as examples of what gains and loses power. You can roughly conclude that more uninterrupted flow with less aggressive pipe bends gives you more hp. And anything with kinks (valvetronic lols) and 180deg bends will lose you hp.

[Gearhead55]

This is an oversimplification, but generally more flow will give you more power up top but you will lose low-end and midrange beyond a certain point. Just a general rule of thumb to keep in mind when looking at designs and pipe diameters. With these cars there is not a ton of power to be made by changing the section 3 alone.

[Altaran]

With these cars there is not a ton of power to be made by changing the section 3 alone.

Agreed. If you're trying to prepare with a good section 3 for doing headers & section 1 later on, it may make sense.

OM Scorza is supposed to make power, I'm not sure about the sgt version, but since it's just a carryover it should also have limited power gains. There were some quality concerns back then, but I bought my OM Scorza used on the old forums 11 years ago and it's still running good after countless trackdays.

Every other track M3 here in Germany is running the Supersprint race, so those will also be good for power.

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[Tbonem3]

I'll say this, go look at every time someone uninstalls an aftermarket muffler and goes back to stock. They all say the same thing every time.

[discoelk]

Track cars are also running aftermarket exhausts bc the OEM stuff is heavy not necessarily for power. Just something to keep in mind.

[bavarian3]

Agreed. If you're trying to prepare with a good section 3 for doing headers & section 1 later on, it may make sense.

OM Scorza is supposed to make power, I'm not sure about the sgt version, but since it's just a carryover it should also have limited power gains. There were some quality concerns back then, but I bought my OM Scorza used on the old forums 11 years ago and it's still running good after countless trackdays.

Every other track M3 here in Germany is running the Supersprint race, so those will also be good for power.

To clarify, I already have genuine euro headers and HJS section 1 cats. I'm not looking to make power with a muffler, but rather trying to avoid losing power, and generally just trying to learn if there's data/consensus out there outside the two mentioned. I'm personally changing it for weight loss, nicer tips, more volume(no need to go down this subjective debate).

Funny enough, this setup is already a-hole level loud around city streets if you want it to be(WOT).

[bavarian3]

I'll say this, go look at every time someone uninstalls an aftermarket muffler and goes back to stock. They all say the same thing every time.

Oh yeah, what do they say? It sounded like a honda? lol.

[Halftim3]

I hear most of the aftermarket mufflers drone and the ones that don't drone are:
Dinan
Scorza
Scza
and Supersprint Street.

[Grey Phox]

Ive seen this said before about the El Diablo specifically, but unless you spend all your time in high revs, is this loss even noticeable? That's an honest question. I don't know how you drive your car. If you track it and your looking to squeeze every single HP from it, I would understand that I guess. I've always taken any claim about an intake or exhaust making any noticeable difference in power on cars (its been pretty much all BMW for me since my first car in 2003, an E28) and disregarded it. An Eventuri intake, at least on their site, claims a big increase with the intake on an E46. I honestly think its a bunch of bullshit. But it sounds nice lol. I would love an intake, but to me the Eventuri looks absolutely horrible and Id rather keep it stock unless I was getting a CSL/Karbonius intake.

The way I see it, its now a 20yr old M car. Its quick for what it is, but there's plenty of new Hondas and Volkswagens that will dogwalk me lol so whatever hp I'm loosing there isn't making a difference. Even my E36 was faster than my E46 M3 is now, at one point.

I have an El Diablo with stock section 1 and 2, and while I couldn't tell you if I'm loosing power, it makes me happy whenever I drive it.