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      06-17-2018, 10:12 AM   #265
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Quote:
Originally Posted by CT335xi View Post
I just looked at BPC posted dyno graph for the n63tu 347/399 and those seem pretty low for dynojet , considering the flywheel rating is 445/480 and probably under rated estimate at best from bmw. Also if the test vehicle was rwd they should of been even high because of less drive train loss 2 vs 4.
This has been the mystery for us 50i guys we have dynos now but no baselines . The other dyno I posted was on Dynojet and he hit 531 and 580. BPC showing hella more torque but much lower HP. I am not sure to make of them all except they are putting down some nice numbers. i am just trying to find time to go baseline and dyno the tune and put it to rest.
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      06-17-2018, 10:53 AM   #266
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As much as I love all of this. I think it's time to move this dyno convo to another thread fellas. Let's keep this about the muffler delete.
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      06-17-2018, 11:49 AM   #267
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Quote:
Originally Posted by Maverik259 View Post
As much as I love all of this. I think it's time to move this dyno convo to another thread fellas. Let's keep this about the muffler delete.
Good point, one should be made for 35i and 50i so people can see the comparisons and preferably with a baseline to see the gains. Sorry about contributing to the off topic subject but it’s hard to resist when others are posting.
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      06-17-2018, 04:02 PM   #268
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I'll create a thread for 50i. Maverick is right - let's keep this thread for muffler delete (otherwise it will get very complex for new users to find info in this thread).
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      06-17-2018, 09:05 PM   #269
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Lol love you both. Hope I didn't come off rude. Just wanted to hear more about all you're doing! And about people doing the muffler delete cuz I still need to do it. Dragging my feet a bit. Haha
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      06-18-2018, 07:30 AM   #270
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Speaking of mufflers.....can we mod the muffler on the 50i like you could on the e90 platform? Keep everything stock looking but have that extra sound
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      06-18-2018, 07:54 AM   #271
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Quote:
Originally Posted by frenchie1013 View Post
Speaking of mufflers.....can we mod the muffler on the 50i like you could on the e90 platform? Keep everything stock looking but have that extra sound
Yes, it's possible. You'll need to cut it open and replace all perforated pipes with straight pipes. Then close muffler as it was before and weld it. You basically have a straight pipe going through muffler. So it will be almost same sound as this muffler delete mod (you'll still have to add/weld in x-pipe in mid section) but with a stock muffler still on the car. It's just extra work and probably extra $$, but it's doable.
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      06-18-2018, 08:32 AM   #272
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Quote:
Originally Posted by Maverik259 View Post
Lol love you both. Hope I didn't come off rude. Just wanted to hear more about all you're doing! And about people doing the muffler delete cuz I still need to do it. Dragging my feet a bit. Haha
Stop dragging your feet already....
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      06-27-2018, 11:37 AM   #273
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Originally Posted by delviacv2 View Post
So I went today to Meineke today and the 3" X pipe that I Bought is way too wide for the tunnel where the pipes run thru , so I re Order a 2.5" X pipe maybe I can get this done Saturday. They Quote me $423.09 and I'm supplying the X pipe and the Tips.
Yours sounds fantastic.
What exactly did you tell Meineke to do?

Does anyone know if its the same on the 2018 50i?
Mines a lease - Anyone know of any issues doing this as far as thats concerned?
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      06-27-2018, 12:28 PM   #274
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Quote:
Originally Posted by becker800 View Post
Yours sounds fantastic.
What exactly did you tell Meineke to do?
Just tell them to install the X pipe (where the 2 pipes meet after the resonators and tell them to cut off the muffler at the rear and make sure that they leave enough piping to re-install/re-weld the muffler if you have to. (you have to on your case to return the lease) and basically they have to make 2 short pipes to reach the bumper opening and install the aftermarket Tips of your preference.
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      07-01-2018, 10:18 PM   #275
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Quote:
Originally Posted by DuSh View Post
Quote:
Originally Posted by vastano View Post
so for this mod, its the addition of the X-pipe and what else? Do you open up the muffler and replace the perforated pipes with solid pipes?

Thanks!
Add x-pipe and delete muffler (eg. take it off and store in your closet). Keep the tips - you will reuse them or you can buy aftermarket tips that you like. Saves about 50lbs weight and opens up deep V8 sound nicely.

Naturally instead of muffler - you are going to weld in some L-shape pipes (mandrel bent) and attach tips to them. That's it.

P.S. Mandrel bent only means they use a machine that bends them smoothly and nicely without edges. Sorry for typos
So do I need to buy pipes and do you know of a shop that can do this for me? I wonder if this would affect my lease upon return...
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      07-02-2018, 08:31 AM   #276
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Originally Posted by Padfan9 View Post
So do I need to buy pipes and do you know of a shop that can do this for me? I wonder if this would affect my lease upon return...
Those of us who did this muffler delete mod - didn't buy pipes - usually muffler shops have them in stock in abundance (they do custom piping everyday - that's their main job basically). Any local muffler shop can do it. It's fairly easy job. The only thing is to avoid large chain muffler shops (as they usually are busy with regular muffler sales and may not touch this job) - and ask any local custom muffler shop.

This muffler delete will sound drastically different, I mean it's loud. So you can't just return it like that after your lease ends (at least not without dealership noticing it). So you can just put muffler back before lease ends. I paid $280 for the job. And probably about same when you'll decide to put muffler back to return a lease. So consider it as a $600 mod in total.
Whether it's worth it for you to spent that money to have deep V8 sound during your lease period - it's up to you man. You have to decide for yourself. For some people they couldn't care less about sporty V8 sound. For others (like me) a good sounding exhaust is important.
Also, in comparison to buying an aftermarket sport exhaust for 50i like some Eisenmann or Akrapovich for $5-7k - this mod is basically pennies compared to those expensive exhausts.
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      07-02-2018, 12:06 PM   #277
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Quote:
Originally Posted by DuSh View Post
Quote:
Originally Posted by Padfan9 View Post
So do I need to buy pipes and do you know of a shop that can do this for me? I wonder if this would affect my lease upon return...
Those of us who did this muffler delete mod - didn't buy pipes - usually muffler shops have them in stock in abundance (they do custom piping everyday - that's their main job basically). Any local muffler shop can do it. It's fairly easy job. The only thing is to avoid large chain muffler shops (as they usually are busy with regular muffler sales and may not touch this job) - and ask any local custom muffler shop.

This muffler delete will sound drastically different, I mean it's loud. So you can't just return it like that after your lease ends (at least not without dealership noticing it). So you can just put muffler back before lease ends. I paid $280 for the job. And probably about same when you'll decide to put muffler back to return a lease. So consider it as a $600 mod in total.
Whether it's worth it for you to spent that money to have deep V8 sound during your lease period - it's up to you man. You have to decide for yourself. For some people they couldn't care less about sporty V8 sound. For others (like me) a good sounding exhaust is important.
Also, in comparison to buying an aftermarket sport exhaust for 50i like some Eisenmann or Akrapovich for $5-7k - this mod is basically pennies compared to those expensive exhausts.
It's definitely important to me. Now I need to find the shop!
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      07-03-2018, 12:21 PM   #278
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Quote:
Originally Posted by AZTWW View Post
This has been the mystery for us 50i guys we have dynos now but no baselines . The other dyno I posted was on Dynojet and he hit 531 and 580. BPC showing hella more torque but much lower HP. I am not sure to make of them all except they are putting down some nice numbers. i am just trying to find time to go baseline and dyno the tune and put it to rest.
I did a baseline on a mustang dyno, as did CT335xi.
http://f15.bimmerpost.com/forums/sho....php?t=1507189
The problem is that neither of us has done a flash tune yet so there are no direct comparisons available.
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      07-21-2018, 08:25 AM   #279
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Quote:
Originally Posted by DuSh View Post
This muffler delete will sound drastically different, I mean it's loud.

So it still sounds loud? I've read earlier someone say there may have been an engine self-adjustment, where it reverts back to the OEM sound, even after the delete.

True? Fake news?


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      07-21-2018, 09:10 AM   #280
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Quote:
Originally Posted by Falafel Combo View Post
So it still sounds loud? I've read earlier someone say there may have been an engine self-adjustment, where it reverts back to the OEM sound, even after the delete.

True? Fake news?


I put about 2K miles on mine after the delete, as of yesterday still loud 😅
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      07-21-2018, 09:19 AM   #281
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Originally Posted by Falafel Combo View Post
So it still sounds loud? I've read earlier someone say there may have been an engine self-adjustment, where it reverts back to the OEM sound, even after the delete.

True? Fake news?

It is not possible to "revert back to the OEM sound" unless you reinstall all the parts that were removed! Over time, the "tone" of an exhaust system may change slightly as mufflers wear in. However, in this case there are no mufflers and the remaining exhaust parts (resonators, cats, etc) are already "broken-in". Physics dictates that the volume of the exhaust will not change simply with the passage of time.
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      07-21-2018, 12:14 PM   #282
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Quote:
Originally Posted by Rotzy View Post
It is not possible to "revert back to the OEM sound" unless you reinstall all the parts that were removed! Over time, the "tone" of an exhaust system may change slightly as mufflers wear in. However, in this case there are no mufflers and the remaining exhaust parts (resonators, cats, etc) are already "broken-in". Physics dictates that the volume of the exhaust will not change simply with the passage of time.
Not simply a factor of time elapsing, but the theory was that the engine was behaving differently in an effort to control exhaust emissions and the resulting adjustment left the exhaust note muted again.

I'm probably explaining it all wrong, but something along these lines.
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      07-21-2018, 12:14 PM   #283
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Quote:
Originally Posted by delviacv2 View Post
I put about 2K miles on mine after the delete, as of yesterday still loud 😅


That's great news!!!
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      07-21-2018, 12:18 PM   #284
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Quote:
Originally Posted by Falafel Combo View Post
Not simply a factor of time elapsing, but the theory was that the engine was behaving differently in an effort to control exhaust emissions and the resulting adjustment left the exhaust note muted again.

I'm probably explaining it all wrong, but something along these lines.
No, I understand what your saying. But since the 50i doesn't have exhaust valves there is nothing for the computer to adjust.

Any computer based adaptations to fuel, spark, timing, etc. happen fairly quickly and are so small that long term exhaust sound changes should be non-existent.
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      08-03-2018, 12:05 PM   #285
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So glad I found this thread and thank you to all those who posted pics/videos. I pick up my '14 50i tomorrow and can't wait to have this done.

Anyone in the Houston area have this done? if so, where did you go?
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      08-05-2018, 12:00 AM   #286
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Quote:
Originally Posted by Falafel Combo View Post
So it still sounds loud? I've read earlier someone say there may have been an engine self-adjustment, where it reverts back to the OEM sound, even after the delete.

True? Fake news?


Oh it's definitely loud. I get slightly different tones with 91 octane and 100 octane (the one I tired just now). With 91 you get more rumble, with higher octane it's more refined, but still loud.

P.S. I think maybe, just maybe the only thing that changed after 300-400miles after first delete - was volumetric adjustments. I'm a noob, but could it be DME senses (via O2 sensors) a bit easier flow (due to muffler delete) and it changed a bit something (not really sure what, maybe corrected afr or something else).
The only reason I'm saying it - is because right after delete - you get really loud rumble especially on acceleration. Then it changes a tiny bit, like someone turned volume knob one click down - that's what I thought was DME adjusting, but I may be completely wrong. I know that for example when changing stock cats to catless downpipes - DME adjusts for increased volumetric flow. I'm not sure how fast that adjustment is done, so I'm not at all an expert in this.

It can also be I'm just imagining things or we get accustomed to loud exhaust quickly enough to think it's toned down a bit. Yeah, maybe it's just placebo effect.
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