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      02-27-2017, 03:32 AM   #1
chentw
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downpipe needed for x4 35i

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I want to install a downpipe for my 35i. Does anyone currently have a downpipe installed on their 35i? Or any suggestion where I can get one? I currently have the M performance exhaust installed on my car. Also have a racechip installed. But replacing with a JB4 tomorrow.
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      02-27-2017, 06:27 PM   #2
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I bought and installed a catless downpipes for my X3 from Ultimate Racing about a year now and it's been working great.

http://www.ultimate-racing.com/colle...3-35i-downpipe

Seeing as the X3/X4 35i both share the same downpipe part number it should be able to fit your X4.

On a side note, since I've gone catless I hear my wastegate rattling like crazy. It affects some N55 owners but I don't think it hampers the performance. Just something to keep in mind.
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      02-28-2017, 01:13 AM   #3
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chentw where do you live?
You can buy this member DP http://x3.xbimmers.com/forums/showthread.php?t=1353592 m7mad

ina93 Ultimate-Racing has 3.5" downpipe does not fit the 2014+ X3/X4 35i nor X4 M40i because (EWG) has 4" Downpipe

I have a thread where I tried the Ultimate Racing Dp and didnt work and got one Custom made by @AIMperformanceNJ
http://x3.xbimmers.com/forums/showthread.php?t=1316376
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      02-28-2017, 04:25 PM   #4
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I actually just bought my downpipe from m7mad. Should arrive next week. Cant wait!!!
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      03-01-2017, 02:18 AM   #5
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Also I would recommend a Flash over jb4.
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      03-01-2017, 03:07 AM   #6
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Nice exhaust - there are few of them

You know there is an early thread: Has anyone....... with video of a Russian X4 being dyno tested. With downpipe.

I checked - it is on page 2.
-first video - STD exhaust
-2:d video, first Sport - then Track
-3:d video - dyno. Note black cloud - probably unburned fuel to cool exhausts.

Last edited by Tjalle; 03-01-2017 at 03:46 AM.
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      03-01-2017, 01:37 PM   #7
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FSociety A local car modification shop owner told me he could program the JB4 for me but it will cost $300. I am not sure if I should do it or just use map 1 and map 2. He says he drives an x6 35i and there is no significant difference when running on map 1 and 2.

@Tjalle I saw the thread on that one
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      03-01-2017, 02:44 PM   #8
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Quote:
Originally Posted by chentw View Post
FSociety A local car modification shop owner told me he could program the JB4 for me but it will cost $300. I am not sure if I should do it or just use map 1 and map 2. He says he drives an x6 35i and there is no significant difference when running on map 1 and 2.

@Tjalle I saw the thread on that one
There's huge difference btwn map1 and 2 lol
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      03-01-2017, 03:44 PM   #9
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FSociety I mean the preprogram map 1 and 2 on the JB4 does not add significant power according to that auto shop owner.
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      03-01-2017, 06:04 PM   #10
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Quote:
Originally Posted by chentw View Post
FSociety I mean the preprogram map 1 and 2 on the JB4 does not add significant power according to that auto shop owner.
PM your location btw thats 100% incorrect there's a big difference between both maps.
For ex, map1 is for any car even OEM adds a mild boost increase of up to 4psi.
Map2 requires 93 octane & preferably downpipes and adds up to 6psi

I still say you will have a better more enjoyable drive with Bootmod3 Flash
https://www.protuningfreaks.com/pages/bootmod3-faq

http://f30.bimmerpost.com/forums/sho....php?t=1321857
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      03-08-2017, 12:08 PM   #11
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Quote:
Originally Posted by FSociety View Post
PM your location btw thats 100% incorrect there's a big difference between both maps.
For ex, map1 is for any car even OEM adds a mild boost increase of up to 4psi.
Map2 requires 93 octane & preferably downpipes and adds up to 6psi

I still say you will have a better more enjoyable drive with Bootmod3 Flash
https://www.protuningfreaks.com/pages/bootmod3-faq

http://f30.bimmerpost.com/forums/sho....php?t=1321857
is JB4 available for F25/F26 now? last i knew it was not.
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      03-09-2017, 09:53 AM   #12
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Chentw, can you confirm fitment of that Brondex downpipe once it's done, please? Their site says it's 89mm, or 3.5" and all EWG N55 are supposedly 4".
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      03-09-2017, 09:54 AM   #13
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All X4 are EWG, X3 2011-2013 are PWG, 14+ X3 are EWG
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      03-13-2017, 10:06 PM   #14
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hardparker I am installing it next monday. Now I am worried it may not fit.

BOSSBMW I email Burger Motorsports and they said its compatible. I just put it on and no check engine light so far. I will do a dyno soon.
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      03-14-2017, 11:29 AM   #15
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Prepared to be disappointed with the JB4 on dyno ; 2 of us have done it already a fellow X3 35i member even added meth and made what I made on 93 octane and Flash tune (now) same (Mustang Dyno type) low-reading.
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      03-21-2017, 12:50 AM   #16
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hardparker Just installed it today. The downpipe fits. However, the O2 sensor does not fit on a x4 35i. Luckily JB4 prevented the check engine light for now (not sure if this is true because someone else told me this).
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      03-21-2017, 08:07 AM   #17
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Quote:
Originally Posted by chentw View Post
hardparker Just installed it today. The downpipe fits. However, the O2 sensor does not fit on a x4 35i. Luckily JB4 prevented the check engine light for now (not sure if this is true because someone else told me this).
Do you have a picture of your installation?
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      03-21-2017, 01:46 PM   #18
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I didnt take a picture of the new downpipe installed in the car. But this is what I got. I think its way too loud. I actually just keeps it in sport mode most of the time.
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      03-21-2017, 03:40 PM   #19
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Yea you'll get use to the sound, downpipe will take the stress away from the turbo too.
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      03-21-2017, 09:51 PM   #20
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Quote:
Originally Posted by chentw View Post
hardparker Just installed it today. The downpipe fits. However, the O2 sensor does not fit on a x4 35i. Luckily JB4 prevented the check engine light for now (not sure if this is true because someone else told me this).
Glad to hear it fits. It seems like a pretty nice downpipe. Does the sensor angle make it bump into something? Maybe an right angle anti-fouler would work, if you care.
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      03-22-2017, 12:51 AM   #21
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Any sound clips?
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      03-22-2017, 11:14 PM   #22
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The O2 sensor was too long and bump into something. I heard burger motorsports sell something that will check off the engine light caused by an aftermarket downpipe. Does someone know what it is called?

I will make a video sometime next week.
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