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      04-14-2019, 12:04 PM   #1
gtank
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Exhaust Flap Mod on 40i

Hi All,

It looks like most of the other B58ers are pulling a fuse to keep the exhaust servo in open position. This keeps both sides at start up for a slightly improved sound (not much else). Has anyone attempted this?

Looking at the wiring diagram below, it appears to be exactly the same as the G01. Fuse 203 is the one to pull.

Wiring diagram: https://www.newtis.info/tisv2/a/en/g...tem/1VncivKdVC

G01 Thread on the topic: https://x3.xbimmers.com/forums/showt...260&page=7

I'm gonna see if this works.
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      04-14-2019, 05:41 PM   #2
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Alright, got it to work. As most know, just warming up the car and revving it won't open the flap, both in Sport Plus or otherwise. I tried every combo.

Here's what I did:

Step 1: Open the fuse panel and find #203
Step 2: Ask someone to drive
Step 3: Get in the trunk...really
Step 4: In Sport Plus, ask the driver to carefully go down a side street in M2
Step 5: At 40 Mph, pull the fuse.

Couldn't think of a better way and now know the trunk is quite spacious.
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      04-15-2019, 05:54 PM   #3
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My wife is gonna laugh at me if i make her drive while i do this. Where is the fuse box in the trunk btw
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      04-15-2019, 06:48 PM   #4
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It's on the back right. My wife thought it was pretty hilarious and wouldn't let me out. Ah well, it worked.

You could just sit in the back seat with one seat down and reach back to pull the fuse.
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      04-27-2019, 07:43 PM   #5
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Will try it tomorrow when i empty out the trunk didnt realize u have to remove the trunk floor to open the fuse box. Nothing is simple with BMW.
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      07-24-2019, 02:45 PM   #6
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Just bought my X5 40i last week. Love the car so far! So is it the one labeled 7.5 on the far left? I can see it is gone in your picture and I still have that one so I am going to go ahead and assume that's it. I guess I'll get someone to drive my car for me so I can try this out. Hopefully I don't end up with a CEL.
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      07-26-2019, 04:03 PM   #7
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Let us know what you think after you do it.
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      08-14-2019, 12:22 PM   #8
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Just curious if anyone else has done this and it worked, and no CEL? Was hoping to do this, and not have to go underneath and pull the spring. Thanks!
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      08-22-2019, 08:57 AM   #9
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Any video on driveby, WOT, partial throttle, cold-start to share?

I'll have my G05 40i home in the first week of September. Hopefully sometime in that first 2-3 weeks I can get the truck into my preferred shop - I'm going to see what they can work up for a better outbound sound. Otherwise it'll have to wait until closer to Halloween.

This is the shop who came up with the "OEM Exhaust Mod" that was the bees knees on the V8 E9x platform cars. Hopefully they can deliver something appealing to my ears and not so offensive to my wallet.
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      09-05-2019, 06:13 PM   #10
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Quote:
Originally Posted by JLino1 View Post
Just curious if anyone else has done this and it worked, and no CEL? Was hoping to do this, and not have to go underneath and pull the spring. Thanks!
tagging along as i finally going to have time to do this...
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      09-07-2019, 06:18 PM   #11
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The G01 thread also had some discovery on a cold weather with the flap going back to close position permanently. I'd be careful about this mod.

https://www.bimmerpost.com/forums/sh...php?p=24608559
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      09-08-2019, 11:28 AM   #12
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Quote:
Originally Posted by eagle_bmw View Post
The G01 thread also had some discovery on a cold weather with the flap going back to close position permanently. I'd be careful about this mod.

https://www.bimmerpost.com/forums/sh...php?p=24608559
It'll be really easy to tell if it's closed in cold weather...you'll have exhaust coming from only one side on startup. Pretty easy to put the fuse back in and start over.

My car has been running flawlessly and it always makes me happy hitting remote start and walking up to the car!
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      09-08-2019, 07:15 PM   #13
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Quote:
Originally Posted by gtank View Post
Quote:
Originally Posted by eagle_bmw View Post
The G01 thread also had some discovery on a cold weather with the flap going back to close position permanently. I'd be careful about this mod.

https://www.bimmerpost.com/forums/sh...php?p=24608559
It'll be really easy to tell if it's closed in cold weather...you'll have exhaust coming from only one side on startup. Pretty easy to put the fuse back in and start over.

My car has been running flawlessly and it always makes me happy hitting remote start and walking up to the car!
I understand it is pretty easy to check and reset but my point is it is not a 'set and forget it' kind of mod. One should keep checking if the flap has closed every time to avoid possible issues as mentioned in the x3 post.

Just a friendly warning to others who might have missed possible issue with this mod.
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      09-08-2019, 08:49 PM   #14
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Quote:
Originally Posted by eagle_bmw View Post
Quote:
Originally Posted by gtank View Post
Quote:
Originally Posted by eagle_bmw View Post
The G01 thread also had some discovery on a cold weather with the flap going back to close position permanently. I'd be careful about this mod.

https://www.bimmerpost.com/forums/sh...php?p=24608559
It'll be really easy to tell if it's closed in cold weather...you'll have exhaust coming from only one side on startup. Pretty easy to put the fuse back in and start over.

My car has been running flawlessly and it always makes me happy hitting remote start and walking up to the car!
I understand it is pretty easy to check and reset but my point is it is not a 'set and forget it' kind of mod. One should keep checking if the flap has closed every time to avoid possible issues as mentioned in the x3 post.

Just a friendly warning to others who might have missed possible issue with this mod.
Ok, just know it's not an apples-to-apples comparison with the G01. While both are done via a fuse pull, on the G05 you actually have to be at WOT driving vs. the other triggered after warm up and done at idle.

It was pretty hard to get the valve opened and I'd expect it will never return to back normal position. If that did happen, my only risk is slightly more exhaust back pressure, but that can be fixed by simply opening the trunk, pulling the panel and plugging one fuse back in (oh my!).

Man, this forum is getting really lame. We may as well be talking about Sienna minivans...
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      09-08-2019, 09:56 PM   #15
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Quote:
Originally Posted by gtank View Post
Quote:
Originally Posted by eagle_bmw View Post
Quote:
Originally Posted by gtank View Post
Quote:
Originally Posted by eagle_bmw View Post
The G01 thread also had some discovery on a cold weather with the flap going back to close position permanently. I'd be careful about this mod.

https://www.bimmerpost.com/forums/sh...php?p=24608559
It'll be really easy to tell if it's closed in cold weather...you'll have exhaust coming from only one side on startup. Pretty easy to put the fuse back in and start over.

My car has been running flawlessly and it always makes me happy hitting remote start and walking up to the car!
I understand it is pretty easy to check and reset but my point is it is not a 'set and forget it' kind of mod. One should keep checking if the flap has closed every time to avoid possible issues as mentioned in the x3 post.

Just a friendly warning to others who might have missed possible issue with this mod.
Ok, just know it's not an apples-to-apples comparison with the G01. While both are done via a fuse pull, on the G05 you actually have to be at WOT driving vs. the other triggered after warm up and done at idle.

It was pretty hard to get the valve opened and I'd expect it will never return to back normal position. If that did happen, my only risk is slightly more exhaust back pressure, but that can be fixed by simply opening the trunk, pulling the panel and plugging one fuse back in (oh my!).

Man, this forum is getting really lame. We may as well be talking about Sienna minivans...
Please don't get me wrong. I want to try this as well and I'd like to thank you for initiating the post.

You did acknowledge that there is a risk. I'm just stating the fact the possible issue in the x3 forum that I found buried in later post. I figured it is something that interested enthusiast would be good to know.
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      10-19-2019, 12:09 PM   #16
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40i exhaust mod...can this really be this easy?

Saw this you-tube...
Seems so easy...can it really work & be this easy?
Why haven't I seen this on the G05 forum???

/Users/garyfranklin/Desktop/How To Make A BMW X5 Sound Better For Free!! | G05 BMW X5 40i - YouTube.webloc
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      10-31-2019, 09:46 PM   #17
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I just opened the flaps through my tune. Sounds much better
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      11-01-2019, 11:23 AM   #18
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Quote:
Originally Posted by dubsesd View Post
I just opened the flaps through my tune. Sounds much better
Which tune?
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      11-05-2019, 08:32 PM   #19
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Quote:
Originally Posted by dubsesd View Post
I just opened the flaps through my tune. Sounds much better
I'm also curious, what tune?
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      11-07-2019, 10:35 AM   #20
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In another thread, he indicated he was a beta tester for the Bootmod3 tune.

I'm waiting for that tune as well... hopefully any day.
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      11-12-2019, 11:03 AM   #21
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Wouldn’t we be able to use the Carly Device to open the flap and then pull the fuse, instead of unhooking the wire harness by the exhaust?

Anyone know or try this method?

Quote:
Originally Posted by GTF View Post
Saw this you-tube...
Seems so easy...can it really work & be this easy?
Why haven't I seen this on the G05 forum???

/Users/garyfranklin/Desktop/How To Make A BMW X5 Sound Better For Free!! | G05 BMW X5 40i - YouTube.webloc
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      11-12-2019, 02:18 PM   #22
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Quote:
Originally Posted by Stealthall View Post
Wouldn’t we be able to use the Carly Device to open the flap and then pull the fuse, instead of unhooking the wire harness by the exhaust?

Anyone know or try this method?
Literally just saw this youtube clip too. It seems to work so I don't see why it wouldn't work for others who try it. I just don't think that was an option when this question was originally asked and responded to by everyone.
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