BHR Mid-Pipe Sound Video
Thread Starter
3-wheeler
Joined: Dec 2005
Posts: 2,734
Likes: 1
From: Phoenix
BHR Mid-Pipe Sound Video
Ok, it's finally been put together.
Here's the link for the youtube video with our sound samples.
http://www.youtube.com/watch?v=J0ocVv5Vx_w
Here's the link for the youtube video with our sound samples.
http://www.youtube.com/watch?v=J0ocVv5Vx_w
Last edited by Flashwing; May 1, 2009 at 05:11 AM.
These threads crack me up. Has anyone taken any sort of SPL measurements yet? I mean I bought an exhaust because it sounded awesome on Youtube, but when I had it installed it practically made me deaf...
Edit: I'm specifically curious about the in-cabin volume levels.
Edit: I'm specifically curious about the in-cabin volume levels.
Last edited by Zeon; Apr 30, 2009 at 06:53 AM.
Nice! You could really tell the difference in tone between the 2 mid-pipes on Flashwing's ride and the stocker. The stocker still 'sounded' stock, but it has a slightly deeper tone to it. The way Flashwing described the difference's with the pipe is spot on.. You could really tell his has been mellowed out...I also noticed that he had a significant drop in the pop pop popping noise. (Man, I'm sooo glad I don't have a stock exhaust anymore, they sound terrible!)
Thread Starter
3-wheeler
Joined: Dec 2005
Posts: 2,734
Likes: 1
From: Phoenix
If you want something to compare it to, simply listen to my first #1 sample as that's the sound you DO NOT want. Otherwise, if you enjoy the sound of your cat-back then you'll like this pipe.
Now, before any of you think we did an incomplete and ****-poor job of this I would like to point out a few things. This was just a preliminary test to see if we should spend any more time with this particular pursuit. We will also do spectral analysis, at some point before release of the midpipe and we will do backpressure-testing, as well (not that anybody will really understand the implications but we have a lot of data-****** around here who like to gaze at numbers 
).
Here is what we measured with my professional sound-pressure level meter;
1) 6' distance at idle.
2) 25' distance at 4K rpms.
3) In-cabin at idle.
4) In-cabin at 4K rpms.
Espelir Cat-Back w/B+B midpipe. Espelir Cat-back w/BHR prototype.
1) 79 1) 75
2) 82 2) 77
3) 73 3) 67
4) 72 4) 73
Stock Cat-back/Stock Catpipe. Stock Cat-back/BHR prototype
1) 68 1) 68
2) 67 2) 67
3) 67 3) 69
4) 70 4) 72
Tanabe/Mazsport. Tanabe/BHR
1) 71 1) 73
2) 65 2) 68
3) 67 3) 67
4) 73 4) 71
Keep in mind that most people cannot even distinguish changes in the 1-2dB range and that THIS test does not account for frequency groupings that are dampened/accentuated between the various pipes. Until we do the spectral analysis, all I can tell you to do is ask those who owned the test cars for their descriptions of the before/after.
).Here is what we measured with my professional sound-pressure level meter;
1) 6' distance at idle.
2) 25' distance at 4K rpms.
3) In-cabin at idle.
4) In-cabin at 4K rpms.
Espelir Cat-Back w/B+B midpipe. Espelir Cat-back w/BHR prototype.
1) 79 1) 75
2) 82 2) 77
3) 73 3) 67
4) 72 4) 73
Stock Cat-back/Stock Catpipe. Stock Cat-back/BHR prototype
1) 68 1) 68
2) 67 2) 67
3) 67 3) 69
4) 70 4) 72
Tanabe/Mazsport. Tanabe/BHR
1) 71 1) 73
2) 65 2) 68
3) 67 3) 67
4) 73 4) 71
Keep in mind that most people cannot even distinguish changes in the 1-2dB range and that THIS test does not account for frequency groupings that are dampened/accentuated between the various pipes. Until we do the spectral analysis, all I can tell you to do is ask those who owned the test cars for their descriptions of the before/after.
Last edited by Charles R. Hill; Apr 30, 2009 at 10:11 AM.
Now, before any of you think we did an incomplete and ****-poor job of this I would like to point out a few things. This was just a preliminary test to see if we should spend any more time with this particular pursuit. We will also do spectral analysis, at some point before release of the midpipe and we will do backpressure-testing, as well (not that anybody will really understand the implications but we have a lot of data-****** around here who like to gaze at numbers ).
Here is what we measured with my professional sound-pressure level meter;
1) 6' distance at idle.
2) 25' distance at 4K rpms.
3) In-cabin at idle.
4) In-cabin at 4K rpms.
Espelir Cat-Back w/B+B midpipe. Espelir Cat-back w/BHR prototype.
1) 79 1) 75
2) 82 2) 77
3) 73 3) 67
4) 72 4) 73
Stock Cat-back/Stock Catpipe. Stock Cat-back/BHR prototype
1) 68 1) 68
2) 67 2) 67
3) 67 3) 69
4) 70 4) 72
Tanabe/Mazsport. Tanabe/BHR
1) 71 1) 73
2) 65 2) 68
3) 67 3) 67
4) 73 4) 71
Keep in mind that most people cannot even distinguish changes in the 1-2dB range and that THIS test does not account for frequency groupings that are dampened/accentuated between the various pipes. Until we do the spectral analysis, all I can tell you to do is ask those who owned the test cars for their descriptions of the before/after.
).Here is what we measured with my professional sound-pressure level meter;
1) 6' distance at idle.
2) 25' distance at 4K rpms.
3) In-cabin at idle.
4) In-cabin at 4K rpms.
Espelir Cat-Back w/B+B midpipe. Espelir Cat-back w/BHR prototype.
1) 79 1) 75
2) 82 2) 77
3) 73 3) 67
4) 72 4) 73
Stock Cat-back/Stock Catpipe. Stock Cat-back/BHR prototype
1) 68 1) 68
2) 67 2) 67
3) 67 3) 69
4) 70 4) 72
Tanabe/Mazsport. Tanabe/BHR
1) 71 1) 73
2) 65 2) 68
3) 67 3) 67
4) 73 4) 71
Keep in mind that most people cannot even distinguish changes in the 1-2dB range and that THIS test does not account for frequency groupings that are dampened/accentuated between the various pipes. Until we do the spectral analysis, all I can tell you to do is ask those who owned the test cars for their descriptions of the before/after.
You could def tell a difference with Flashwing's car. The levels for the others sounded about the same for me except for the stock one. I guess it was really just the 'tone' that made it seem louder.
Mu ha.. ha...
Joined: Aug 2004
Posts: 14,361
Likes: 3
From: Cali
I think there is something wrong with the video.
All I can hear is music.
It would be nice to get a sound level at 60, 65, and 70 mph on the freeway.
Even a Video with sound while driving may be helpful.
Edit: Tone sounds good
All I can hear is music.
It would be nice to get a sound level at 60, 65, and 70 mph on the freeway.
Even a Video with sound while driving may be helpful.
Edit: Tone sounds good
That should help a lot of people that are concerned about sound.
not too sure what Paul is complaining about 
Ray, if you could get an agency power DR pipe comparison im sure interest in this would go way up. Its obvious this pipe is better than most other single resonated, but your real competition is in the dual resonated pipes. That being the racing beat coming up, agency power, and the mazsport, which already looks like your pipe is quieter in cabin atleast (the important part for people wanting a quiet one)
Good job though guys! i wish i lived in your area to hang out for these shenanigans
Ray, if you could get an agency power DR pipe comparison im sure interest in this would go way up. Its obvious this pipe is better than most other single resonated, but your real competition is in the dual resonated pipes. That being the racing beat coming up, agency power, and the mazsport, which already looks like your pipe is quieter in cabin atleast (the important part for people wanting a quiet one)
Good job though guys! i wish i lived in your area to hang out for these shenanigans
not too sure what Paul is complaining about
Ray, if you could get an agency power DR pipe comparison im sure interest in this would go way up. Its obvious this pipe is better than most other single resonated, but your real competition is in the dual resonated pipes. That being the racing beat coming up, agency power, and the mazsport, which already looks like your pipe is quieter in cabin atleast (the important part for people wanting a quiet one)
Good job though guys! i wish i lived in your area to hang out for these shenanigans
Ray, if you could get an agency power DR pipe comparison im sure interest in this would go way up. Its obvious this pipe is better than most other single resonated, but your real competition is in the dual resonated pipes. That being the racing beat coming up, agency power, and the mazsport, which already looks like your pipe is quieter in cabin atleast (the important part for people wanting a quiet one)
Good job though guys! i wish i lived in your area to hang out for these shenanigans
Mazsport is not an issue. Theirs requires modification to the cross members.And it wears out in about 10-15,000 miles. I have some video of one.
Thread Starter
3-wheeler
Joined: Dec 2005
Posts: 2,734
Likes: 1
From: Phoenix
The primary issue is the fact that there's no flow data with any of the dual resonated mid-pipes to suggest that there's any kind of a performance gain. Couple that with a heavier and bulkier design AND the fact that the glass/wool packing will burn out due to the excessive exhaust gas temperatures.
In the end, you're looking at minimal performance gains, if any, and a product which will only work less as time goes by. In the end, all done to keep a mostly stock sound.
Our goal was to be able to produce a quality tone with a single resonator. While we clearly could fabricate a dual resonated version of our pipe I'm pretty sure that people will enjoy the sound.
In the end, you're looking at minimal performance gains, if any, and a product which will only work less as time goes by. In the end, all done to keep a mostly stock sound.
Our goal was to be able to produce a quality tone with a single resonator. While we clearly could fabricate a dual resonated version of our pipe I'm pretty sure that people will enjoy the sound.
Mu ha.. ha...
Joined: Aug 2004
Posts: 14,361
Likes: 3
From: Cali
Well... doesn't the baby need a horn to toot?
You can clean up your old exhaust and make it into a horn.
Music helps creat intelligence so you win both ways.
A musical intrument and a musical sounding car.
You can clean up your old exhaust and make it into a horn.
Music helps creat intelligence so you win both ways.
A musical intrument and a musical sounding car.
