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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > B58 Turbo Engine / Drivetrain / Exhaust Modifications > BMW 340i B58 VRSF Downpipe DIY :) NO CEL ;) *SOUND CLIP* Stock exhaust+Catless DP
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      10-07-2017, 02:00 AM   #1
F30MGM
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BMW 340i B58 VRSF Downpipe DIY :) NO CEL ;) *SOUND CLIP* Stock exhaust+Catless DP

Hi fellow b58 ppls. Im pretty sure most of yall dont want to spend 400$ at a shop to install the your brand new downpipes so Im making a DIY for you all, It took me 3 hours or so to put it in because ive never done a downpipe in my life before, but I will show you a trick later that will save you a LOT of time. I went through the headache but now I will save you time ;D

Needed tools:
1x Ratchet
1x 14mm
1x 13mm
1x Pipe expanding tool 3"
22mm Wrench
1x Anti Seize Paste
1x 8mm socket
1x pick tool




Step 1 Put car on Jack Stands
Step 2remove airbox ofc


Step 3 Remove Under tray cover



STep 4 Remove Oxygen Sensor Wires. This one is a little tricky, unplugging them is easy, just twist the locking part press down and pull out but to get the o2 sensor wire off the plastic wire box cover thingy use a 90 degree pick tool and press the locking tab down and wiggle it out

]

Step 5 Unbolt DP to midpipe (IIRC it was a 13mm)


STep 6 unbolt downpipe to turbo(Bolt is under the turbo using a V-Clamp Feel for it when the engine is cool to touch(IIRC its a 13mm socket use a deep socket)



Step 7 With the DP and everything disconnected there is 2 nuts holding the DP to the car(Sorry i forgot to take picture, but just look down and reach for the two 14mm nuts and loosen them, at this point your DP is probably stuck to your midpipe still so all you have to do is wiggle the darn thing out

Step 8 Once youve gotten the DP off the car remove the two pre cat and post cat O2 Sensors with a 22mm wrench


Step 9 Stick a small amount of anti seize paste on the threads so its not a PItA to get off later down the road if you have to.


Step 10
****** NO CEL TRICK*******
Errr so for you "Track and Offroad only/Not legal for street" people errr all you have to do is buy a 90 degree o2 sensor extension and place it in this orientation which can be found here:

https://www.amazon.com/Degree-Angled.../dp/B00B1U6I54

*********NOTE THIS IS FOR OFF ROAD USE ONLY NOT LEGAL FOR STREET USAGE*********: lol:

OH and yes you will still pass inspection if its OBD2 only





Step 11 *********MAJOR KEY This single handed took me two hours of anguish because i did not use the pipe expansion tool. the down pipe would not fit nicely and now my neck hurts like crap because of this

********
With the Pipe expanding tool make the inlet on the midpipe bigger like this. You can rent one of these @ autozone or oreilly for FREE


STep 12
Start putting DP back where old one was


Step 13 Line up the DP to turbo and put the v clamp back on and tighten the clamp on the midpipe as well as bolting the midpipe nut back on to hold it in place(I forgot to mention removing that earlier but im pretty sure that is self explanatory.

Step 14 Plug in O2 Sensors

Step 15 Put undertray cover back on

Step 16 Close hood jack the car down GO TAKE A SHOWER because i know at this point you probably have black all over yourself for whatever reason. And we dont want you dirtying the inside of your nice new BMW now would we?

Step 17 Go do some 0-60 pulls and let me know how it goes

Sound clip per request:
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Last edited by F30MGM; 10-08-2017 at 03:55 PM.. Reason: SC
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      10-07-2017, 02:42 AM   #2
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sound clip! sound clip! sound clip!
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      10-07-2017, 08:34 AM   #3
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Great write up, thank you kindly sir
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      10-08-2017, 08:36 AM   #4
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That's a lot of work put into the post for the benefit of us forum members. Thank you so much for your time and efforts. Greatly appreciated.
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      10-08-2017, 01:12 PM   #5
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Removal of under tray is not needed to change DP.
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      10-08-2017, 03:56 PM   #6
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soundclip added, and for the undercover, you gain some access to certain angles which are nice to have when youre under the car, so i took mine off
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      10-08-2017, 06:32 PM   #7
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Awesome write up!
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      10-09-2017, 09:19 AM   #8
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And thanks for the thanks guys means a lot, I just know that when i was younger I relied on DIYs back on e46fanatics to fix up my old 328i. Now that I have extension knowledge of cars and whatnot I see this as my way of giving back to the car community
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      11-11-2017, 10:18 PM   #9
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The cel light is still off? Heard the O2 extension/90degree dont foul the bmw's?
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      11-11-2017, 11:29 PM   #10
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Quote:
Originally Posted by drivef30 View Post
The cel light is still off? Heard the O2 extension/90degree dont foul the bmw's?
Quote:
Originally Posted by drivef30 View Post
The cel light is still off? Heard the O2 extension/90degree dont foul the bmw's?
Yessir. All readiness monitors passed
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      11-11-2017, 11:45 PM   #11
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Quote:
Originally Posted by F30MGM View Post
Quote:
Originally Posted by drivef30 View Post
The cel light is still off? Heard the O2 extension/90degree dont foul the bmw's?
Quote:
Originally Posted by drivef30 View Post
The cel light is still off? Heard the O2 extension/90degree dont foul the bmw's?
Yessir. All readiness monitors passed

remove

Last edited by drivef30; 07-24-2019 at 06:41 PM..
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      11-11-2017, 11:48 PM   #12
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Quote:
Originally Posted by drivef30 View Post
Quote:
Originally Posted by F30MGM View Post
Quote:
Originally Posted by drivef30 View Post
The cel light is still off? Heard the O2 extension/90degree dont foul the bmw's?
Quote:
Originally Posted by drivef30 View Post
The cel light is still off? Heard the O2 extension/90degree dont foul the bmw's?
Yessir. All readiness monitors passed

Sweet, I tried install Vrsf but it didn't fit good. Did it take you a while to line it up? I got the turbo vclamp on but no matter what angle I used I could get the dp to slide all the way into the mid pipe, on about a inch (I did use expanders as well). Any suggestions , plus did your vrsf have the hanger bolts missing too? (the original dp had 2 bolts on a hanger, vrsf didn't) (my car is n20 but pretty similar)
Lined up very easy. I used wd40 on the exhaust inlet also that might help. It's a fairly straightforward install. I was missing hanger bolts as well. There is no spot for them but I doubt it matters
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      11-29-2017, 07:38 PM   #13
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You're sure an O2 spacer would keep CEL off?
I wanna to buy a downpipe but the only thing holding me back is the CEL and I'm not interested for a tune.
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      11-29-2017, 07:39 PM   #14
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Quote:
Originally Posted by Panda340i View Post
You're sure an O2 spacer would keep CEL off?
I wanna to buy a downpipe but the only thing holding me back is the CEL and I'm not interested for a tune.
100%. My cel still is off.
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      11-29-2017, 07:48 PM   #15
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Quote:
Originally Posted by F30MGM View Post
Quote:
Originally Posted by Panda340i View Post
You're sure an O2 spacer would keep CEL off?
I wanna to buy a downpipe but the only thing holding me back is the CEL and I'm not interested for a tune.
100%. My cel still is off.
Sounds great!
Hope it doesn't light up!
Also how do you like VRSF so far?
Choosing between ER and VRSF
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      11-29-2017, 07:50 PM   #16
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Quote:
Originally Posted by Panda340i View Post
Quote:
Originally Posted by F30MGM View Post
Quote:
Originally Posted by Panda340i View Post
You're sure an O2 spacer would keep CEL off?
I wanna to buy a downpipe but the only thing holding me back is the CEL and I'm not interested for a tune.
100%. My cel still is off.
Sounds great!
Hope it doesn't light up!
Also how do you like VRSF so far?
Choosing between ER and VRSF
Love it. Gives it a nice exhaust note at higher Rpms. Sounds kind of hollow in a way but I love it
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      11-29-2017, 09:04 PM   #17
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Great post! Thank you for your effort!
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      11-29-2017, 09:05 PM   #18
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Quote:
Originally Posted by Panda340i View Post
Great post! Thank you for your effort!
Quote:
Originally Posted by Panda340i View Post
Great post! Thank you for your effort!
Anytime man I just try to contribute to the community I've been there done that not knowing how to do things so now that I do I can finally give back
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      12-09-2017, 11:09 PM   #19
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sorry to ressurect this guy, but how are you doing with the spacer/CEL ?
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      12-09-2017, 11:26 PM   #20
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Quote:
Originally Posted by paimon.soror View Post
sorry to ressurect this guy, but how are you doing with the spacer/CEL ?
Still check engine light free
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      12-10-2017, 12:21 AM   #21
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nice work!
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      12-10-2017, 02:34 PM   #22
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Quote:
Originally Posted by F30MGM View Post
Still check engine light free
Thats awesome. I am hoping I have the same luck. Not sure if it is worth just getting an L spacer like yours, or getting something like this

http://www.fabspeed.com/universal-o2...tic-converter/

The 911 guys have had some great luck with this, wondering how the F chassis do.
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