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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > 325 to 335 Exhaust Conversion - Help Needed



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      03-05-2011, 09:44 PM   #1
enron29
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325 to 335 Exhaust Conversion - Help Needed

So, I'm in the process of getting ready to do a 325 to 335 exhaust conversion. I won't be using any muffler, as I have a muffler delete already. I'll just be putting in a Y-pipe, that I already have, and running separate piping. However, while getting setup before I go to the weld shop, I have run into some things that I have questions on and would like to get opinions on.

First, I was originally going to remove the whole trunk storage unit, but then realized while doing it that numerous things were attached to it underneath. One of them being that gas fume tank or whatever it is. So what I did was I took it out, and cut it apart, leaving just the side for the tank to still mound to.

I figured this would give me a straight shot, but at the end, I realized that the one side is still in the way (the side I left to hold the tank). Also, as you can see in the pics below, there is still the under-cover piece.

My questions are:

1. Do I just cut the under-cover piece that is seen in the pictures back far enough where it doesn't interfere with the pipe and tip?

2. What should I do with the heat shield now that is just floating and doesn't have anything to connect to?

3. Anyone who did this, do you just leave out the piece shown in the pics below that was to hold the diffusor on primarily?

4. Also, is a worse gas mileage to be expected from this since it seems like you're creating more drag at this area?

Again, here are the pics. Any help/advice/anything is greatly appreciated. Thanks.







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      03-05-2011, 11:32 PM   #2
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well you can make it look like this with out cutting the storage..
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      03-06-2011, 01:55 AM   #3
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well you can make it look like this with out cutting the storage..
I'm assuming that black canister wasn't relocated in this setup either?
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      03-06-2011, 02:19 AM   #4
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I'm assuming that black canister wasn't relocated in this setup either?
nope you dont have to do that unless you do take out the extra storage compartment and convert it with the 335 storage compartment as you can see in this thread... LTBMW | E92 328 w/ Vanguard 335 exhaust
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      03-06-2011, 02:26 AM   #5
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Ok, so my next question would be about the wind underneath there. Is there a lot of wind that travels under the car. Just wondering about the diffusor flexing a lot since there is more room for the air to hit and the diffusor isnt attached as much. Also wondering about age mileage going down too.
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      03-06-2011, 03:12 AM   #6
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well alot of wind goes under there but it wont do anything to the diffuser alot of people has done this mod already and there has not been any wrong with it.. as for mileage going down i dont know..
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      03-06-2011, 06:43 PM   #7
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can someone actually point out on this image where exactly is the activated charcoal filter?? I jus keep reading about it but cant see what everyone's referring to??
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      03-06-2011, 07:23 PM   #8
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can someone actually point out on this image where exactly is the activated charcoal filter?? I jus keep reading about it but cant see what everyone's referring to??
On this car it's located to the left of the left muffler, behind (above in the picture) the rear wheel. You can see the white hose headed under the cover to it.
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      03-06-2011, 08:04 PM   #9
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well you can make it look like this with out cutting the storage..



Is this on your own car? I would really like to do this to my car and put a resonator just before it does the Y in place of the secondary cats. This looks really
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      03-06-2011, 09:09 PM   #10
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im doing this tuesday!!
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      03-06-2011, 11:03 PM   #11
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Is this on your own car? I would really like to do this to my car and put a resonator just before it does the Y in place of the secondary cats. This looks really
no this is not my car.. this is someone on the forum that has done this.. and this is what he did after... two res on the y pipe..
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      03-07-2011, 12:39 AM   #12
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no this is not my car.. this is someone on the forum that has done this.. and this is what he did after... two res on the y pipe..
What was the members name? Was it to loud how he had it? Did he have any resonator on it at all before? He did the exact setup I had thought of doing. I originally thought about the bmw PE but its still a heavy pig. Sorry I feel like i just
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      03-07-2011, 12:55 AM   #13
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What was the members name? Was it to loud how he had it? Did he have any resonator on it at all before? He did the exact setup I had thought of doing. I originally thought about the bmw PE but its still a heavy pig. Sorry I feel like i just
his screen name is koreez88.. i believe at first it was a muffler delete and res delete.. then he put the two res on to quiet it down..
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      03-07-2011, 03:30 PM   #14
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If I recall correctly he actually put in the resonators cause it was not only super loud but also drone crazy..
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      03-08-2011, 04:44 PM   #15
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Does anyone have any diagrams or ideas above moving that charcoal filter for the gas fumes? I'd really like to move it so I can completely remove the storage unit that it's connected to and create a completely clear shot, but the tubes connected to it don't seem that flexible in order to move it. If anyone has any thoughts or pictures on how to move it and re-mount it somewhere, I would greatly appreciate it. Thanks.
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      03-08-2011, 05:05 PM   #16
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can someone actually point out on this image where exactly is the activated charcoal filter?? I jus keep reading about it but cant see what everyone's referring to??
The charcoal filter is on the right hand side to move it there is not easy ...the BMW 328 I with the vanguard exhaust is my car ...got it done at ltbmw took like 7 hours to move all the part to put the exhaust on ..
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      03-08-2011, 05:54 PM   #17
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The charcoal filter is on the right hand side to move it there is not easy ...the BMW 328 I with the vanguard exhaust is my car ...got it done at ltbmw took like 7 hours to move all the part to put the exhaust on ..
Yeah, I really want to move it, but I'm not sure how to. I really don't want to mess with disconnecting and re-connecting all the hoses involved, let alone extending them. Has anyone just relocated it slightly without too much work.
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      03-08-2011, 09:21 PM   #18
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Ok, so the only issue I'm having right now is moving/relocating that gas charcoal filter. I just spent an hour taking things apart and trying to move this filter box. The hoses coming out of it are not flexible at all. I was hoping I could turn it 90 degrees to free up some room, but I'm afraid of breaking the tubes or connections. I could push it up into the free area where the storage unit use to be, but again, I worry about putting extra stresses on the connections to the filter box, and it wouldn't allow the lid/cover in the trunk to close flush. This is not the best options.

So is there no way to relocate this darn thing without modifying the tubing running to it? Please let me know.
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      03-10-2011, 03:42 PM   #19
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Ok, so the only issue I'm having right now is moving/relocating that gas charcoal filter. I just spent an hour taking things apart and trying to move this filter box. The hoses coming out of it are not flexible at all. I was hoping I could turn it 90 degrees to free up some room, but I'm afraid of breaking the tubes or connections. I could push it up into the free area where the storage unit use to be, but again, I worry about putting extra stresses on the connections to the filter box, and it wouldn't allow the lid/cover in the trunk to close flush. This is not the best options.

So is there no way to relocate this darn thing without modifying the tubing running to it? Please let me know.
e90 is slightly different underneath than the e92 i think..i posted a pic in post # 5 in this thread where i relocated http://www.e90post.com/forums/showthread.php?t=371258

I only moved it a few inches though just enough to fit snug in the bracket.
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      03-10-2011, 06:14 PM   #20
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e90 is slightly different underneath than the e92 i think..i posted a pic in post # 5 in this thread where i relocated http://www.e90post.com/forums/showthread.php?t=371258

I only moved it a few inches though just enough to fit snug in the bracket.
Is that just the battery compartment to the right that you bolted it to? Or did you weld the bracket to that? And how did you attach the bracket to the canister?

http://i43.tinypic.com/r01jkg.jpg
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      03-10-2011, 07:29 PM   #21
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Is that just the battery compartment to the right that you bolted it to?
yeh just drilled a small hole for a screw and bolted it up with a washer.

Quote:
Or did you weld the bracket to that? And how did you attach the bracket to the canister?

http://i43.tinypic.com/r01jkg.jpg
actually a small weld was also done up towards the top of the canister, to ensure it wouldn't slip. I will try to get better pics. The canister just "slips" into the bracket, like a cradle.
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      03-13-2011, 03:15 PM   #22
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yeh just drilled a small hole for a screw and bolted it up with a washer.



actually a small weld was also done up towards the top of the canister, to ensure it wouldn't slip. I will try to get better pics. The canister just "slips" into the bracket, like a cradle.
So you can weld to both the battery compartment and the vapor canister?
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