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      07-21-2019, 10:12 AM   #1
proteus290
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Drives: 2014 BMW X1 35I Ultimate
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Garage List
Smile New Exhaust and Tune for 14 35I X! N55

2014 X1 35I N55 mineral White m sport ultimate package


Looking for some nice parts to upgrade soon :

WTB Supersprint exhaust items



Stock N55 needs to get pepped up soon with exhaust mods,vrsf turbo intake piping so it will breathe better



RK flash tune recomended by local dealer parts guy,
Tune for E84 n55 ,

wish i knew this when i had intake off send ecu into bench flash it


supersprint downpipe maybe $$$
supersprint muffler

still pricey looking at oval custom exhaust piping and h pipe crossover too would like dual exhaust outlets in back of modded or 15 model dual outlet exhaust valance






down pipe /soon
charge pipe /done
exhaust muffler/soon
alignment check for front end too

etc



any local help for this project located in Austin Tx? mechanical wisdom always welcome

Last edited by proteus290; 01-29-2020 at 11:35 AM.. Reason: update
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      07-23-2019, 01:41 PM   #2
RoWoX3M
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I can't comment on the BMS JB4 but many people on here seem to have good experiences with it. I had the stage 1 tune from BMS and didn't like it. The power delivery was all over the place. I currently have the Dinan stage 2 software. The power doesn't feel that much more than stock but there's definitely a bump. Zero throttle or power issues. Feels like stock plus.

Charge pipe upgrade is a must on N55. Mine went while I was under warranty and the dealer said it's a wear/tear item and wouldn't cover it.

As far as exhaust, there aren't many direct bolt-on options for our cars. You could use the BMW PE or Dinan from the 135 which will require slight modification but it is totally doable. I had the Active Gen II exhaust and there was just too much resonance for me despite AA saying "no drone." I ended up doing a secondary cat and resonator delete with stock muffler. Sounds good enough for me.
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      07-26-2019, 08:48 AM   #3
themishmosh
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I will be putting my JB4 up for sale soon but have a vacation coming up so not really interested in moving it at the moment. Already sold my X1 N55 for a 2020 Explorer ST because I needed the size.

I think the biggest thing about the JB4 is the codes that pop up on even a properly working car. It used to clear codes automatically but if you are on the current ISO software or purchase a new one, they do not and you will need to do that periodically. Otherwise, power is undeniable.
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X1 35i, H&R springs, Bilstein HD shocks, BMS JB4, BMS chargepipe, xHP trans flash
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      07-29-2019, 09:41 PM   #4
bucketfoot
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Must be an N55 thing. I haven't had a single code pop up with the JB4 on my N20.
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      08-04-2019, 01:40 AM   #5
Chicone
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Quote:
Originally Posted by bucketfoot View Post
Must be an N55 thing. I haven't had a single code pop up with the JB4 on my N20.
Do you have the older version? Sounds like it. I want one, maybe I’m wrong but it seems a little like a unpolished product/ hack. The Dinan flash sounds OK but there is no way to tweak it. There are other options too but they seem limited/ not as good. I’m plowing ahead with the chargepipe and then probably the downpipe, and hopefully by the time I get em done, I’ll have the rest figured out or I’ll just cave and get a JB4.
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      08-05-2019, 09:06 AM   #6
bucketfoot
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Quote:
Originally Posted by Chicone View Post
Do you have the older version?
Just bought it last year, so not likely. but again, I've got the N20/28i version not the N55/35i one.
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      08-13-2019, 09:09 PM   #7
NemoX1
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I have a jb4 and a catless downpipe that I recently removed from my 2014 Xdrive35i. Had them on the car about a year. Went back to stock. I haven't researched the resale market on these. Make me an offer? I'm in Arizona.
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