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Discussion Starter #1
The mass M5 owner opts for the SuperSprint X-pipe but has anyone tried a H-Pipe on their exhaust system?

"An H pipe gets its name because there is a piece of pipe that connects each side of the pipe that connects to the header collectors (hence the name H pipe). This pipe is supposed to help equalize the pressure and thereby create a better scavenging effect. An X pipe however, has each side of the pipe meet in an X type junction. Again the idea is to equalize pressure and create better scavenging. As a general rule, H pipes allow for more low-end torque and slightly less Horse Power than X pipes do. Also, the sound note is quite different. The X pipe has a raspy sound while the H pipe is more “muscle car” sounding. As mentioned, the mid-pipe choice seems to be a personal sound preference and most people who use chambered mufflers opt for the H pipe, while the straight through users tend to choose the X pipe. Typically, the X pipe/straight through muffler combination yields higher HP and lower torque than the H pipe/chambered muffler design. "
 

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I have always heard that the x-pipe is merely an evolution from the h-pipe. It, in theory, accomplishes the exact same thing, but the x-pipe just does it that much more efficiently. I actually read that on this messageboard many years ago. I would run a search about the topic.

'Rocket
 

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it makes sense that the xpipe works better as there is a more direct convergence of the pipes versus the hpipe

the E46 m3 has an hpipe in the stock piping..and let me tell you, it does jack for sound.
 

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SC'dKellenersM5 said:
the E46 m3 has an hpipe in the stock piping..and let me tell you, it does jack for sound.
Definitely have to agree with that one... hiha
 

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The stock M5 exhaust utilizes an H-pipe design as well. located between the cats and the resonators. I would think that flow would be better thru an x-pipe design but it makes one think about back pressure and whether an h-pipe is designed to provide that balance of back pressure/free flowing air? I do believe the xpipe improves sound quality tho.

al
 

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Discussion Starter #6 (Edited)
From all the M5 exhaust sound samples available I have to agree that the X-pipe adds a "raspy" sound to the exhaust........I can only speak from a previous H-pipe setup on a 302 5.0L engine and it does sound deeper and "mean" ........we'll see how it sounds on the M5....
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Discussion Starter #7

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Discussion Starter #10
bmwusa said:
It shouldnt take too long for you to get this all fabbed up, I am looking forward to hearing your setup, Im sure you will, but try and document "photos " of each step if the shop doesnt mind, Im interested in how all this works out, Josh
The DYNOMAX SUPERTURBOS(17784) 2.5" have been ordered......pictures and sound to follow.....
 

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marcvip said:
The DYNOMAX SUPERTURBOS(17784) 2.5" have been ordered......pictures and sound to follow.....
turbo's and an H pipe, really curious to hear how it sounds, probably great. (i used those mufflers on my 67 gto when i was in highschool!)
Keep us posted.
Mike
 
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