550i M Sport Exhaust Valve
02-05-2011, 10:23 AM
#1
Members
Thread Starter
Join Date: Oct 2010
Location: South East uk
Posts: 78
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: BMW 550i M Sport
Hi All, in the exhaust outlet on both sides, One pipe has a vacuum operated butterfly Valve, does anyone know for sure just what this is for?.
Is it purely for noise suppression at low revolutions around town, or for back pressure at low RPM's?.
Is it purely for noise suppression at low revolutions around town, or for back pressure at low RPM's?.
02-05-2011, 10:40 AM
#2
Members
Thread Starter
Join Date: Oct 2010
Location: South East uk
Posts: 78
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: BMW 550i M Sport
02-05-2011, 09:27 PM
#3
Super Moderator
Join Date: Mar 2004
Location: Pittsburgh, PA USA
Posts: 17,310
Likes: 0
Received 2 Likes
on
2 Posts
My Ride: G30 M550i
Model Year: 2018
Check out some of our threads on the subject (BTW, many of the posts are from JDN and other "veterans"):
https://5series.net/forums/topic/2861-exhaust-question
https://5series.net/forums/topic/298...uffler-exhaust
https://5series.net/forums/topic/481...ap-open-closed
https://5series.net/forums/topic/381...f-resonators-r
https://5series.net/forums/topic/392...-muffler-valve
https://5series.net/forums/topic/2861-exhaust-question
https://5series.net/forums/topic/298...uffler-exhaust
https://5series.net/forums/topic/481...ap-open-closed
https://5series.net/forums/topic/381...f-resonators-r
https://5series.net/forums/topic/392...-muffler-valve
02-06-2011, 12:15 AM
#4
Members
Thread Starter
Join Date: Oct 2010
Location: South East uk
Posts: 78
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: BMW 550i M Sport
Check out some of our threads on the subject (BTW, many of the posts are from JDN and other "veterans"):
https://5series.net/forums/topic/2861-exhaust-question
https://5series.net/forums/topic/298...uffler-exhaust
https://5series.net/forums/topic/481...ap-open-closed
https://5series.net/forums/topic/381...f-resonators-r
https://5series.net/forums/topic/392...-muffler-valve
https://5series.net/forums/topic/2861-exhaust-question
https://5series.net/forums/topic/298...uffler-exhaust
https://5series.net/forums/topic/481...ap-open-closed
https://5series.net/forums/topic/381...f-resonators-r
https://5series.net/forums/topic/392...-muffler-valve
Thread
Thread Starter
Forum
Replies
Last Post
SFx550i
Private Member Classifieds
11
04-14-2015 05:00 PM