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

[mrgizmo04]

That far down by section 3, 60 vs 63.5 probably won't have much difference, but that said, because the area goes with square of radius, that is over 10% difference. I don't know if I've seen dynos comparing that necking at section 3 and the actual impact that has.

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[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.

Just to confirm you have a true header to muffler 63.5mm exhaust system?

And you did not see any difference in power with or without stepdowns?

[bmw m3 s50]

That far down by section 3, 60 vs 63.5 probably won't have much difference, but that said, because the area goes with square of radius, that is over 10% difference. I don't know if I've seen dynos comparing that necking at section 3 and the actual impact that has.

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That is what most people are saying on this thread. I always thought that any stepdown would disrupt exhaust flow and potentially not create as much power.

I remember reading something on M3forum that Supersprint was developing a 63.5mm section 3 to offer the e46 M3 a full and true 63.5mm system creating a maximum power increase.

[mrgizmo04]

That is what most people are saying on this thread. I always thought that any stepdown would disrupt exhaust flow and potentially not create as much power.

I remember reading something on M3forum that Supersprint was developing a 63.5mm section 3 to offer the e46 M3 a full and true 63.5mm system creating a maximum power increase.

Yeah but do you need that much pipe, or is that just marketing? I think 2.25 twin pipes can support around 400hp or so from cfm perspective. So maybe the marketing is for top hp numbers on a blown car, I don't know. Don't buy every "performance" part, you'll go broke.

https://www.exhaustvideos.com/faq/how-to-calculate-muffler-size-pipe-diameter/

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[jbfrancis3]

Just to confirm you have a true header to muffler 63.5mm exhaust system?

And you did not see any difference in power with or without stepdowns?

Yep, you can look up a post I created about it.

I don't have exactly that data on with / without. But I posted final results in the dyno sticky thread (post 107) and you'll note I'm not doing any better than others with very similar setups.