Anyone have information on 2.5” oversized Supersprint parts and 2.5” muffler?

[bmw m3 s50]

Wanted to ask if anyone would have some information on the Supersprint systems for the bmw m3 e46. My understanding is Supersprint has developed a lot of the exhaust parts in 2.5”. The step headers, section 1, section 2 can now be purchased in 2.5”. Section 3 are only available in the m3 original exhaust pipe sizing. My understanding is Supersprint can be contacted and they will custom make a Section 3 in 2.5”. I believe Leighton had a Sport muffler in 2.5”.

Can anyone confirm this, that Supersprint will make a 2.5” muffler if requested?

Also regarding the other Supersprint 2.5” parts, are the connection points reduced to the m3 standard diameter size?

I assume section 1 and section 2 reduce down to the m3 exhaust standard piping to accommodate and connect to other stock m3 exhaust parts. So question is does the Supersprint 2.5” create choke points at the connection point due to the piping reduction size?

[Tbonem3]

Yes, and you'd have to in order to avoid a step down at sect 2/3 joint. Otherwise, no stepdowns in the headers/s1/s2. But, custom 2 might not be worth it if we're only talking 1/8th inch for only 3 inch in only one pipe.

[Sharocks]

Section 3 is so far away from making or taking power it's literally just there for sound and noise levels. I don't think it's worth it TBD.

[gorilla69]

There is a supersprint 63.5mm sec 3 option.

[Slideways]

Contact Schmiedimann - https://www.schmiedmann.com . They are a Supersprint dealer and can order custom SS parts. They had no problem ordering a Street Section 3 with Race Tips.

[stash1]

Section 3 is so far away from making or taking power it's literally just there for sound and noise levels. I don't think it's worth it TBD.

Would love to see a back-to-back dyno test on either a higher powered NA, or an FI car, but that would be a very expensive dyno test.

[bmw m3 s50]

Yes, and you'd have to in order to avoid a step down at sect 2/3 joint. Otherwise, no stepdowns in the headers/s1/s2. But, custom 2 might not be worth it if we're only talking 1/8th inch for only 3 inch in only one pipe.

I understand that the stepped headers can be ordered in V1 or V2. The V1 version stepped header would connect to the V1 section 1 which would have a stepdown at the connection point of the section 2 to work with a stock section 2. The same would be for oversized section 2, the connection point to the section 1 and 3 would be stock size since the owner of the section 2 could be using stock components.

Would that step down between exhaust section cause a bottle neck for performance?

[Tbonem3]

No, there's no step down at the end of SS oversized sect 1 where it mates to sect 2. The connection is not a slip fit.

The only step down in a retail/vender sold SS 2.5" products would be what i said in the first post, a 3" long 1/8" reduction at the 2/3 joint, and in only 1 pipe.

[bmw m3 s50]

There is a supersprint 63.5mm sec 3 option.

I saw that there are options on Supersprint's website but not much in terms of any vendor website.

[jbfrancis3]

If using the SS oversized 63.5mm section 1, it does not have a stepdown. When mating to stock section 2, that's where a natural stepdown occurs. When mating to an oversized 63.5mm section 2 (resonated or non-), then there is no stepdown until section 3 mating.

As someone who eliminated all stepdowns, there did not seem to be a performance gain on the dyno by having absolute 2.5" system.

[bmw m3 s50]

Would love to see a back-to-back dyno test on either a higher powered NA, or an FI car, but that would be a very expensive dyno test.

I definitely agree with you on this.

[jbfrancis3]

Forgot to mention - your question of section 3 in oversized 63.5mm. SS does not change the section 2 - to - 3 factory connection which is a smaller diameter, so there will be an insignificant reduction, even if you go for the oversized sections 2 and 3.

[bmw m3 s50]

If using the SS oversized 63.5mm section 1, it does not have a stepdown. When mating to stock section 2, that's where a natural stepdown occurs. When mating to an oversized 63.5mm section 2 (resonated or non-), then there is no stepdown until section 3 mating.

As someone who eliminated all stepdowns, there did not seem to be a performance gain on the dyno by having absolute 2.5" system.

So where does the stepdown occur going from a 63.5 Section 1 to a stock section 2 which is a smaller diameter?

[bmw m3 s50]

Forgot to mention - your question of section 3 in oversized 63.5mm. SS does not change the section 2 - to - 3 factory connection which is a smaller diameter, so there will be an insignificant reduction, even if you go for the oversized sections 2 and 3.

That's what I was getting to with a 63.5 section 3, so regardless there will always be a stepdown in a 63.5 Supersprint system between the section 2 and section 3?

[jbfrancis3]

So where does the stepdown occur going from a 63.5 Section 1 to a stock section 2 which is a smaller diameter?

You answered it 😉

That's what I was getting to with a 63.5 section 3, so regardless there will always be a stepdown in a 63.5 Supersprint system between the section 2 and section 3?

Yes but we're talking but a few millimeters. Maybe its 60mm at that connection, instead of 63.5mm. It won't make a difference. Further to the point, it probably won't make a difference having a regular SS section 3 vs SS oversized section 3. No one can say for sure without validation but that's my intuition, and I think others would agree.