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

dmn my computer is sloow

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.

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!)

Sounds pretty good. Any idea on completion dates? I haven't kept up with the other thread.

Yes we did take some sound level measurements and Charles Hill has the results. He's more of an expert regarding sound and could probably better explain the results.

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 piss-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-whores around here who like to gaze at numbers :lol2:).

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.

nice vid.

Thanks Charles, thats exactly what I was looking for. Numbers are looking pretty good from inside the cabin!

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.

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

Wow that's AWESOME! Great info on the sound readings Charles :bigok: That should help a lot of people that are concerned about sound.

so far so good guys. Nicely done

Thanks Ray for providing both the video and the data with baselines so we can get an understanding of the differences from a subjective and objective standpoint.

That's great stuff!

:bootyshak :smiley309 :ban:

This is nice...

Might be time for me to ditch the gutted stock cat.

I kept seeing some bald guy walking around in the video; totally distracted me from the exhaust analysis.

Sounds good thus far. Good luck guys.

Paul.

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

We are one up on the Dual pipes. We are lighter. Lighter is better. :eyetwitch

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.

Wish I could hear that in person. You keep coming out with stuff my wife will ban me from spending. For some reason she thinks saving money for the baby is more important.:)

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.

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.

this is exciting news guys.

defintely can't wiat till you guys put it into production. defintely looking to get a midpipe.

start production already! :lol:

Remember: Perfection over patience