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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 06-25-2011, 01:56 AM
kenand1988 kenand1988 is offline
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Sorry but I just gotta beat this dead horse

Hey all,

I have browsed this forum and others ever since I got my fern green 99 323is in 2007. I can not describe how happy I have been with this car. I have done a few simple things, shark injector, short shifting kit, poly bushings f&r, k&n air filt (not cai). Awhile back when I first got this car I wanted to do a full exhaust and wound up ordering an e46 borla exhaust and then had to send it back. I later learned that as far as aftermarket exhaust options go for the 323is I was pretty limited so I gave up for awhile. Well I am interested in it again and yes I have read many many many threads and I dont need to be explained why my exhaust is different from the 325's on up to the m3's.

What I plan to do for my exhaust is build a custom exhaust from the headers back. Instead of going to a dual pipe dual cat operation I want to keep it single but go up in pipe diameter from 2.25 to 2.5in all the way back to the muffler. I'll also be putting in a high flow cat and new muffler as well. This is cheaper than having a shop build the dual pipe design and lighter than a used 328 or m3 midpipe and muffler.

What can I expect from this? Will it sound horrible? The new cat will supply good back pressure so I don't believe I will lose any torque. I just haven't seen or heard of anyone doing this so I did not know if this was idiotic. It's all going to cost about $500. I also plan on doing the M50 manifold swap.

Thanks in advance
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  #2  
Old 06-25-2011, 05:46 AM
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dc_wright dc_wright is offline
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Your "custom" exhaust will be more restrictive than your stock exhaust. The combined cross sectional area of two 2.25" pipes is 7.9". The cross sectional area of a single 2.5" pipe is 4.9". You'd need to go to 3.125" pipe to get roughly the same cross section.
What you are going to get for your $500 is something that makes your car run worse, but it will be loud.
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  #3  
Old 06-25-2011, 10:45 AM
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Also, you can bolt any E36 OBD2 6-cylinder exhaust up to a 323, so your choices are not "limited". There is no need to fabricate something yourself.
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  #4  
Old 06-25-2011, 12:26 PM
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I have the dual exhaust you want from a 328is Bolt that bad boy on and you'll be good to go
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  #5  
Old 06-25-2011, 01:04 PM
kenand1988 kenand1988 is offline
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UPDATE: I did some more digging and 2.5in seems to be optimal for an n/a 6 cylinder. Even though the 325's,8's, and m3's run dual 2in the dual setup creates more drag.

I will probably lose around 50lbs by replacing the full stock exhaust with a single 2.5in pipe all the way back.

I just can't decide what muffler to go with.


all this info can be found here
http://forums.bimmerforums.com/forum/sh ... 354&page=3

There are even some clips of a guys 2.5 single exhaust on his m3 with a borla muffler.
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  #6  
Old 06-25-2011, 01:47 PM
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Yeah, exhaust is simple stuff.


The stock Catback for E36's weighs 49 pounds.


An aftermarket catback usually weighs around HALF of OEM.
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  #7  
Old 06-25-2011, 01:51 PM
Eight Thirty Eight Thirty is offline
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  #8  
Old 06-25-2011, 02:33 PM
kenand1988 kenand1988 is offline
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http://forums.bimmerforums.com/forum...d.php?t=910354
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  #9  
Old 06-28-2011, 03:35 PM
A white m3 A white m3 is offline
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I have the m50 manifold if your interested.
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  #10  
Old 06-28-2011, 05:13 PM
kenand1988 kenand1988 is offline
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this was an attempt to upload pics but it didnt work, ill try again

Last edited by kenand1988; 06-28-2011 at 05:26 PM.
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  #11  
Old 06-28-2011, 05:33 PM
kenand1988 kenand1988 is offline
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view from the rear








If you have any questions ill be happy to answer. This was done by someone who makes racing exhausts for e36's. My exhaust is basically a racing exhaust with a resonator.

I'm working on getting a good soundclip up but my phones microphone wont pick up the low notes.
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  #12  
Old 06-28-2011, 07:43 PM
wawaiki wawaiki is offline
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it will burn your plastic around the tip. what brand is the muffler? And yes please for the video with resonator
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  #13  
Old 06-29-2011, 04:24 AM
projectXe36 projectXe36 is offline
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Im thinking of doing something similar with my 325i. I was thinking of running 3" after the headers all the way back to a muffler no cats... Still playing with the idea so idk well see. Id love to hear how yours sounds
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  #14  
Old 06-29-2011, 10:09 AM
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Quote:
Originally Posted by projectXe36 View Post
Im thinking of doing something similar with my 325i. I was thinking of running 3" after the headers all the way back to a muffler no cats... Still playing with the idea so idk well see. Id love to hear how yours sounds
Did you even read the thread?


A 3" exhaust is overkill.
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  #15  
Old 06-29-2011, 10:14 AM
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ZeGerman ZeGerman is online now
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Quote:
Originally Posted by Moeman10 View Post
Did you even read the thread?

A 3" exhaust is overkill.
Nevermimd the fact that he's in California and wants to delete his cats... Wonder how that will go...
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  #16  
Old 06-29-2011, 11:03 AM
kenand1988 kenand1988 is offline
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Here is a link to a video i shot last night of me starting it up and revving it a little, i apologize you can't really see much though. If you play this through some nice speakers with a sub you get the real idea.



Also, for whoever asked the muffler i believe is part #12258 from magnaflow, it doesn't have a special name.
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  #17  
Old 06-29-2011, 11:07 AM
kenand1988 kenand1988 is offline
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3inch and no cats might not be a great idea.
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  #18  
Old 06-29-2011, 11:28 AM
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Quote:
Originally Posted by kenand1988 View Post
3inch and no cats might not be a great idea.
orly?
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