Quad Exhaust
#1
Members
Thread Starter
Join Date: Jun 2009
Location: Seattle
Posts: 63
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: BMW 550i 20" Forgestar F14 Black
![Default](https://5series.net/forums/images/icons/icon1.gif)
Newbie questio here. I have an 06 550i and would like to upgrade to a quad exhaust system. I know i'm also going to need a new bumper on the rear...any suggestions? Anything else I would need? Thanks for being patient.
#2
Former Vendor
Join Date: Oct 2006
Location: Anaheim, CA
Posts: 19,460
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: F13 M6
![Default](https://5series.net/forums/images/icons/icon1.gif)
we can do a custom quad setup and provide the parts. for the rear, you can do an M5 rear, replica M5 rear, custom cut out your stock bumper, or mtech rear with an aftermarket diffuser.
#3
Contributors
Join Date: Mar 2010
Location: SoCal
Posts: 254
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: '04 545i
'02 SC430
'04 RX330
![Default](https://5series.net/forums/images/icons/icon1.gif)
I went with a M5-rep bumper with my quad and I'm very happy with the results. you can see my thread here: exhaust link
if you do decide to go with M5 or M5-rep bumper, you'll want to get the side and front too
if you do decide to go with M5 or M5-rep bumper, you'll want to get the side and front too
![Thumbsup](https://5series.net/forums/images/smilies/imported/thumbsup.gif)
![](http://xenonrider.com/images/exhaust06.jpg)
#5
Members
Thread Starter
Join Date: Jun 2009
Location: Seattle
Posts: 63
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: BMW 550i 20" Forgestar F14 Black
![Default](https://5series.net/forums/images/icons/icon1.gif)
Thanks guys for the help. Nerwyll, what do you think will be the cost for everything with the custom cut rear or mtech rear with aftermarket diffuser? Also, I read on some post the power loss. What should I do to avoid this?
B
B
#6
Former Vendor
Join Date: Oct 2006
Location: Anaheim, CA
Posts: 19,460
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: F13 M6
![Default](https://5series.net/forums/images/icons/icon1.gif)
to avoid power loss, honestly its best not to go with quad. we can do the RPI exhaust if anything, which is an axle-back bolt on with dyno-proven power.
#7
Members
Join Date: Jun 2010
Location: DFW Area
Posts: 115
Likes: 0
Received 0 Likes
on
0 Posts
My Ride: 2011 Lexus IS-F
![Default](https://5series.net/forums/images/icons/icon1.gif)
If your just removing the OEM mufflers, and installing muffler with an extra pipe to the right, leaving everything else, do you really lose power by just removing the original muffler(s)? I can see if you do a straight pipe, or having free flowing cats, eliminating adding resonators, then you have a good possibility of changing HP, sometimes not in your favor.
#8
Senior Members
Join Date: Dec 2009
Location: Bay Area / Santa Barbara / Florida
Posts: 373
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://5series.net/forums/images/icons/icon1.gif)
Do you have pics of the custom cut on the stock bumper? Do you guys do a trim? Price?
#9
![Default](https://5series.net/forums/images/icons/icon1.gif)
If your just removing the OEM mufflers, and installing muffler with an extra pipe to the right, leaving everything else, do you really lose power by just removing the original muffler(s)? I can see if you do a straight pipe, or having free flowing cats, eliminating adding resonators, then you have a good possibility of changing HP, sometimes not in your favor.
#10
Senior Members
Join Date: Jul 2009
Location: Amsterdam
Posts: 425
Likes: 0
Received 0 Likes
on
0 Posts
![Default](https://5series.net/forums/images/icons/icon1.gif)
I had mine done a month ago. I love the sound it makes on my 530i! Never been on a dyno yet but it didn't feel any different to me. If it did lose power I will be getting a remap later anyway so that will off set the loss.
Looks better though:-)
Looks better though:-)