Can I Run A Straight Pipe For An Exhaust - BMW Forum - BimmerWerkz.com
5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 12-30-2004, 10:42 AM
n00b
 
Join Date: Oct 2004
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
85bmw535i is an unknown quantity at this point
(Thread Starter)
Thumbs up

I have a rotted cat, and instead of paying a couple hundred for a new used one i wanted to go ahead an run a two and a half in single pipe through the exhaust into a new muffler like a dyno max, i was wondering what the side effects of this would be i already have hesitation when i accelerate and i think its because of the exhaust i was wondering if opening the exhaust like that will have any dramatic results on the motor in a bad way. i have a 85 535i straight six. Thanks
85bmw535i is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 12-30-2004, 11:15 AM
5th Gear Member
 
'89 635 csi's Avatar
 
Join Date: Aug 2004
Location: Houston TX
Posts: 1,092
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
'89 635 csi is an unknown quantity at this point
You will be getting rid of the much needed back pressure that your engine must have!
You will lose most of your low end torque.
And you can burn up a valve.
Why don't you just get a high flow cat or even something cheap just for the time being until you can get the right one?
Th eguy I got my '86 from had taken the cat off. When I replaced it I couldn't believe the low end I all of a sudden had.
You will be much happier if you just put another cat on it!

Dave G.
'89 635csi
'86 528e - Sold
'84 528e - Soon to be 533i
'96 Jeep Cherokee 4WD
OO=[][]=OO
'89 635 csi is offline  
#3 (permalink) Old 12-30-2004, 02:47 PM
2nd Gear Member
 
Join Date: Dec 2003
Location: California
Posts: 448
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
frank3 is an unknown quantity at this point
Better check on your state's smog check process. Here in California, you could never get away with that...they'd fail you for 1) removing the cat, 2) modifying the original exhaust system and probably 3) spewing too much pollution out the back.

<span style='color:green'>1994 325i </span>- - - 75,000 mi.
No mods - - - very happy as is!
<span style='color:green'>1995 525i </span>- - - 154,000 mi.
No squeaks or rattles... unreal!
frank3 is offline  
#4 (permalink) Old 12-30-2004, 03:49 PM
5th Gear Member
 
Hoppy's535i's Avatar
 
Join Date: Dec 2003
Location: Agawam/Bridgewater MA
Posts: 1,665
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Hoppy's535i is an unknown quantity at this point
you would have HUGE torque loss. and lets face it the 535 needs that torque

<span style='font-size:11pt;line-height:100%'><span style='color:blue'> theres no replacement for displacement </span></span>
im so hardcore. i dont even have cup holders
<img src='http://madmansrealm.com/forums/uploads/1101610420/gallery_18_1_1103159534.jpg' border='0' alt='user posted image' />
Hoppy's535i is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 5-Series (E12,E28, E34, E39, E60)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Exhaust Pipe Size? 94BMW325i 3-Series (E36) 7 04-14-2005 07:50 AM
323i Single Pipe Exhaust Question vindude69 3-Series (E36) 2 03-22-2005 11:57 AM
Ticketed for loud exhaust in California? Silver4evr Bimmer Talk/Motorsports Talk 0 06-23-2004 05:03 PM
Remus M5 Quad Pipe Exhaust EnFuego66 5-Series (E12,E28, E34, E39, E60) 0 03-17-2004 12:39 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome