HUSH time: RPi silencing cones for E60/E63 Exhaust systems
Thread Starter
Contributors
Joined: Jun 2008
Posts: 754
Likes: 0
My Ride: A Car faster than yours.....
I don't think this is completely true. Some exhausts have this valve to create more back pressure at lower revs which provide more torque and it opens up at higher revs to increase flow.
Then again, the valve is also there to limit sound output to satisfy regulatory requirements.
Then again, the valve is also there to limit sound output to satisfy regulatory requirements.
There is a way we get around that with our systems but I cant post how/why or else we wouldnt be the only company doing it. hehe
Contributors
Joined: Sep 2007
Posts: 7,053
Likes: 0
From: Jersey
My Ride: 2004 530i
Model Year: 2004
Originally Posted by RPIpower' post='983394' date='Aug 20 2009, 12:24 PM
The exhaust on the I6 is really quiet. 
If a mouse had one bean and farted, it would probably be louder than our 525/528/530 exhaust.
If a mouse had one bean and farted, it would probably be louder than our 525/528/530 exhaust.
Contributors
Joined: Aug 2005
Posts: 11,432
Likes: 1
From: San Jose, CA
My Ride: E60 M5, F85 X5M
Originally Posted by RPIpower' post='983394' date='Aug 20 2009, 09:24 AM
No such thing as back pressure. Some factory units use this to keep the velocity up in the low end then opening up during higher rpms and load. This is used to keep the sound down and is not necessary if you have an exhaust designed specifically for performance and not to keep the sound levels down. There is a way we get around that with our systems but I cant post how/why or else we wouldnt be the only company doing it. hehe
There is a way we get around that with our systems but I cant post how/why or else we wouldnt be the only company doing it. hehe
Contributors
Joined: Aug 2007
Posts: 5,765
Likes: 0
From: MPLS, USA
My Ride: 10 Honda Fit Sport, 10 Honda Pilot Touring
Originally Posted by EuroCarFan' post='983174' date='Aug 20 2009, 08:55 AM
I don't think this is completely true. Some exhausts have this valve to create more back pressure at lower revs which provide more torque and it opens up at higher revs to increase flow.
Then again, the valve is also there to limit sound output to satisfy regulatory requirements.
Then again, the valve is also there to limit sound output to satisfy regulatory requirements.
1:19
Thread Starter
Contributors
Joined: Jun 2008
Posts: 754
Likes: 0
My Ride: A Car faster than yours.....
I would say if the person you are dating or wife has a problem after the cones, this might be a good idea. lol
Then again, some of you might already have it.
Then again, some of you might already have it.
Contributors
Joined: Aug 2008
Posts: 9,986
Likes: 1
From: Zoo York
My Ride: Alpine White 2006 530Xi (SLD)
I wonder why not others brand name use the adjustable valve for control over sound. Then customer can make whatever they like.
Just idea only
Attachment 87649
Just idea only
Attachment 87649
The exhaust on the I6 is really quiet. If a mouse had one bean and farted, it would probably be louder than our 525/528/530 exhaust.
No such thing as back pressure. Some factory units use this to keep the velocity up in the low end then opening up during higher rpms and load. This is used to keep the sound down and is not necessary if you have an exhaust designed specifically for performance and not to keep the sound levels down. There is a way we get around that with our systems but I cant post how/why or else we wouldnt be the only company doing it. hehe
No such thing as back pressure. Some factory units use this to keep the velocity up in the low end then opening up during higher rpms and load. This is used to keep the sound down and is not necessary if you have an exhaust designed specifically for performance and not to keep the sound levels down.
There is a way we get around that with our systems but I cant post how/why or else we wouldnt be the only company doing it. hehe
(apologies for the crude sketch - hope it gets the point across)
Senior Members
Joined: Oct 2008
Posts: 1,185
Likes: 0
From: B-Ham, AL
My Ride: '06 550i
'84 Nissan S12 Turbo
I have a silencer for my turbo car that I have, which has a 3" turbo back mandrel exhaust with no cat. The silencer makes a huge difference, can't even hear the exhaust at all inside the car.....good for long trips if nothing else.
Other option.......... if you want to be able to control exhaust tone from a flip of a switch is to install some "exhaust cutouts"....might sound kinda interesting on a 545 or 550.
Here is what they look like......
Here are some installed on a z06.....sounds pretty sick!
Other option.......... if you want to be able to control exhaust tone from a flip of a switch is to install some "exhaust cutouts"....might sound kinda interesting on a 545 or 550.
Here is what they look like......
Here are some installed on a z06.....sounds pretty sick!
