09-08-2016, 11:13 AM | #1 |
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M2 Exhaust vs. MPE Exhaust
This question is based solely on looking at pictures, so anyone that has installed an MPE please chime in.
Yes, there might be less baffling or material in the muffler, etc. But I'm wondering if the majority of the sound gains are resulting from the delete of the center silencer? Seems like a simpler and less expensive mod than gutting the muffler. Thoughts? |
09-09-2016, 02:37 AM | #2 |
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The exhaust flow in MPE can bypass the muffler with electrically controlled valves opened, I believe that's what makes the difference.
Akrapovic uses an identical muffler design but only mates it to a split dual pipe configuration to pursue a better flow capacity in the middle section at the cost of the high velocity of the hot air coming out of downpipe, of which I really doubt the gain outweigh the loss, HP/Torque wise.
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09-09-2016, 08:20 PM | #3 | |
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09-09-2016, 08:26 PM | #4 | ||
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The Dual pipe diameter may be more than enough to support m2 stock flow. Only my speculation though.
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09-09-2016, 09:30 PM | #6 | |
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09-09-2016, 09:50 PM | #7 | ||
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09-09-2016, 09:54 PM | #8 | |
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In most of other cases - removing cats, smoothing passages, etc, the velocity increase. That's why you have more power in the first place - flow gets out quicker.
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09-09-2016, 10:02 PM | #9 |
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The real question I am having here, is whether BMW cheaps out on m2 exhaust by not using a dual system, or m2 power level just don't have that flow for a dual to support.
And what is the dia of Akrapovic dual pipes? Down pipe outlet is 3.5" so the combination of the dual shouldn't be larger than that, which is why it doesn't make much sense to me in the first place. Someone enlightens me or gives some real world before and after please. Until that, Akrapovic is a merely sound mod with no hp loss at best.
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09-10-2016, 09:08 AM | #10 |
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Found one reason for a twin pipe design...
http://www.supersprint.com/ww-en/wha...gn-system.aspx 1. ability to increase velocity and still have cats 2. ability to design out droning Maybe Akrapovic's found using two pipes allowed them to better tune the sound? |
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