Question about Supersprint Stepped + 63.5mm section 1-2 & muffler choice

[Tbonem3]

Ah so it's a step down! This makes more sense. Maybe I can have my fab guy just make it 2.5" if I really wanted that badly lol

That'd be way too much work!

[jbfrancis3]

Stock muffler actually flows very well, better than other 60mm aftermarket ones. See the white paper -

http://www.unofficialbmw.com/images/BMW_M3_Exhaust_System.pdf

You;'d probably gain a few more hp with a true 2.5" muffler, however. Scorza, scza, dinan, megan el supremo, magnaflow are the ones that I know of. SS will do it as a custom job.

Stock muffler does not flow very well. I discovered this on the dyno.

The Dinan will sound good with this combination and flow well.

[Wernd]

Custom order 2.5" SS Street with the Race tips

How do you do that?

[stash1]

There was an old post on M3F back in the day where someone compared mufflers on a low HP turbo M3...I wanna say it was in the low to mid 400 range. They dyno'd w/a factory muffler and then swapped over to the now NLA Diablo Race muffler (2.5" version), and they picked up a considerable amount of power...I wanna say as much as 15-25HP-IIRC. So, at some point, the factory muffler/boat anchor def becomes a restriction, and I'd be willing to bet that it's at a much lower HP point than low 400's. I would guess somewhere around the 320+ mark that it starts becoming a restriction. Gotta remember that the muffler is all the way at the end of the system though, so it's going to have less of an effect on reducing HP than the pipes upstream, but at some point...it will start robbing power.

[c watson]

I have OEM euro headers , OEM euro sec one, OEM sec 2, SCZA .. I like the setup but there was rasp at around 3k that was irking me. I purchased a SS dual resonated sec 2 and that took care of the rasp but did make the car a lot quieter too. I’m not sure if I like it or not. The butt dyno does feel a little kick but nothing to go crazy about.

[Slideways]

How do you do that?

ECS should be able to special order it if they do not have the standard street in stock.

[Gt4]

There was an old post on M3F back in the day where someone compared mufflers on a low HP turbo M3...I wanna say it was in the low to mid 400 range. They dyno'd w/a factory muffler and then swapped over to the now NLA Diablo Race muffler (2.5" version), and they picked up a considerable amount of power...I wanna say as much as 15-25HP-IIRC. So, at some point, the factory muffler/boat anchor def becomes a restriction, and I'd be willing to bet that it's at a much lower HP point than low 400's. I would guess somewhere around the 320+ mark that it starts becoming a restriction. Gotta remember that the muffler is all the way at the end of the system though, so it's going to have less of an effect on reducing HP than the pipes upstream, but at some point...it will start robbing power.

Was it HPF with +600hp car test?

https://www.e46fanatics.com/threads/exhaust-comparison-which-m3-exhausts-outperform-others.520068/

[Syfon]

SuperSprint Lightweight Race

I'm running SS stepped manifolds (I can't recall if they're v1 or v2), StatusGruppe section 1 (twin 2 1/4" with 2 bottle style resonators), SS section 2 3" x pipe (with a Magnaflow 14159 muffler) and SS Lightweight Race section 3.

It really is quite loud, although I get absolutely zero drone and zero rasp

[EthanolTurbo]

Wonder if my Dixis Spirit holds the car back at all with NA power levels considering it's what the smaller piped El Diablo is based on. I'm guessing maybe 5 whp? Doesn't seem to be a massive restriction until you're running a ton of boost.

[stash1]

Was it HPF with +600hp car test?
https://www.e46fanatics.com/threads/...others.520068/

Nah, I think that it was a different article...but that is an interesting read. Personally, I would be shocked if there was only a 10HP difference on a 600HP vehicle between the stock muffler vs a freer flowing muffler!?

[bmw m3 s50]

Does anyone know if there are two versions of the 2.5" twin pipe section 2? It seems that the section 2 reduces down to 2.36" at the connection point for the muffler. Spoke to Supersprint today, they told me that all 2.5" twin pipe section 2 reduce down to 2.36" to connect to the muffler. They also told me that their mufflers use 2.5" tubing after the section 2 connection point. Is this true?

[Tbonem3]

Supersprint's dual pipe sect 2s (res & unres) aren't completely 2.5" in order to play nice with almost any other sect 1/sect3 out there. They will, however, make a full 2.5" version if you have their 2.5" sect 1 (v1) and they're custom 2.5" mufflers or some other full 2.5" muffler like scorza/dinan.

All of their exhaust parts for this car are 60mm except for v1s, and that was true for years until they came out with dual pipe sect 2s more recently. No SS sect 3 has ever had 2.5" piping that I've ever seen (and I owned ss sport mufler, and I measured) except for a custom ordered sect 3 from them.

[bmw m3 s50]

Supersprint's dual pipe sect 2s (res & unres) aren't completely 2.5" in order to play nice with almost any other sect 1/sect3 out there. They will, however, make a full 2.5" version if you have their 2.5" sect 1 (v1) and they're custom 2.5" mufflers or some other full 2.5" muffler like scorza/dinan.

All of their exhaust parts for this car are 60mm except for v1s, and that was true for years until they came out with dual pipe sect 2s more recently. No SS sect 3 has ever had 2.5" piping that I've ever seen (and I owned ss sport mufler, and I measured) except for a custom ordered sect 3 from them.

I am curious to see where the disconnect is. I read here that, as you said, Supersprint will custom make the full 2.5" version and custom 2.5" mufflers or some other full 2.5" muffler but when speaking to them, they said that they do not. They mentioned the only 2.36" part of the exhaust was the connection point of the section 2 and muffler, which makes sense like you said to play nice with other exhausts. They said the rest of the exhaust system is 2.5" expect for the Section 2 "outlets" and muffler "inlets", using their words.

[Tbonem3]

Maybe the piping inside the muffler housing, that you can't see, goes back up to 2.5" (I doubt it), but the piping that is exposed is 60mm, and I've confirmed it myself.

I hope they're not simply referring to the small portion that goes up to 2.5" o.d. simply to slip over another's section's 60mm at the connecting point as that would be disingenuous.

Look above at the picture I posted of the SS race - see how it steps down to 60mm right before it enters the body? Why would it step back up to 2.5" inside? It makes no sense.

[bmw m3 s50]

Maybe the piping inside the muffler housing, that you can't see, goes back up to 2.5" (I doubt it), but the piping that is exposed is 60mm, and I've confirmed it myself.

I hope they're not simply referring to the small portion that goes up to 2.5" o.d. simply to slip over another's section's 60mm at the connecting point as that would be disingenuous.

Look above at the picture I posted of the SS race - see how it steps down to 60mm right before it enters the body? Why would it step back up to 2.5" inside? It makes no sense.

I agree with you. I saw the reduction in your pic and on my twin section 2. The section 2 bolts right up to the Supersprint Street muffler then after a couple inches goes into the canister. So the piping connecting the muffler is 2.36" as well. Again, the reason I ask this, was Supersprint's answer to me is that they do not make any other versions. Is there someone at Supersprint that you need to speak with directly to get the custom setup?