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      08-11-2013, 03:40 AM   #111
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Quote:
Originally Posted by Dackelone View Post
Probably for certain country emission standards. They probably just said it was the same N54 as used before... so no new certification was needed. I think BMW pulled a fast one! We all know the 1M's engine is really a factory tuned engine. Different DME, different higher flowing cats and secondary cats, and it has the PPK hardware too. So its understandable that maybe BMW played with the rules a little bit!
I'd agree with that...........'creative homolgation' I think is the term
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      08-14-2013, 11:24 AM   #112
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I made another cold start video of my PE with N54 mid pipes and the PE's y-pipe resonator delete.
Like I have said many times... I LOVE this sound!!!

PS: please excuse my dirty car and exhaust tips.





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      08-15-2013, 03:27 AM   #113
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Hey Dackel, why don't you try the N55 mids in there? I think you'll like the sound. Leave the resonator on though.
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      08-15-2013, 06:12 AM   #114
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Quote:
Originally Posted by TheRuss View Post
Hey Dackel, why don't you try the N55 mids in there? I think you'll like the sound. Leave the resonator on though.

Its too late for that. I'm not messing with the exhaust now. I am happy with the PE sound. Its loud at wide open throttle(WOT) but quiet during cruising speeds.

One of the reasons I reinstalled the N54 mids(with secondary cats) is I felt I lost a little low end torque with them. I think under 2K you loose a small amount, but you gain more volume and tq at higher revs - so it is a trade off.

I just LOVE the way the PE sounds and just just seems to get better the more miles(kms) I put on the car/exhaust!


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      08-15-2013, 06:27 AM   #115
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Yeah, it's an awesome sound! FWIW, I'm putting my N54 mids back on at the weekend, but that's because my car is too loud/raspy now that I have fitted AR downpipes. I really liked N55 mids with PE rear box though.
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      08-19-2013, 08:47 PM   #116
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Alright, installed the N55 OEM MP's on my N54-powered 1'er, ran into a few little snags with the install, but overall, it was pretty easy. A second set of hands would have been awesome though, when you're just carrying them around, the midpipes aren't too heavy, perhaps 30-40 pounds, but when you're on your back under the car, trying to get everything put into place was a bit tricky. Also, now having been under the car working with the exhaust, I can definitely say that I am not touching the factory DP's, they look like an absolute PITA when you're a jackstand warrior like I am.

I am making a series of two proper comparison videos, one of the stock N54 135i exhaust, and the other with the N55 MP's installed. I'll post a link up to my blog once I get the N55 video edited, the stock exhaust video is uploading now. So look forward to a write up on my experiences and opinions, along with some Go-Pro footage!
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      08-24-2013, 01:36 AM   #117
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Quote:
Originally Posted by Ginger_Extract View Post
Alright, installed the N55 OEM MP's on my N54-powered 1'er, ran into a few little snags with the install, but overall, it was pretty easy. A second set of hands would have been awesome though, when you're just carrying them around, the midpipes aren't too heavy, perhaps 30-40 pounds, but when you're on your back under the car, trying to get everything put into place was a bit tricky. Also, now having been under the car working with the exhaust, I can definitely say that I am not touching the factory DP's, they look like an absolute PITA when you're a jackstand warrior like I am.

I am making a series of two proper comparison videos, one of the stock N54 135i exhaust, and the other with the N55 MP's installed. I'll post a link up to my blog once I get the N55 video edited, the stock exhaust video is uploading now. So look forward to a write up on my experiences and opinions, along with some Go-Pro footage!
Alright, I have gathered everything together, and here it is! My N55MP contribution:

http://jakestumphracing.tumblr.com/p...h-n55-midpipes

I welcome all constructive criticism!
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      08-24-2013, 07:21 PM   #118
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cross posting since its on topic...
http://www.1addicts.com/forums/showt...1#post14554841

Quote:
Originally Posted by CarJunkie View Post
Harold has a link to the before and after dyno for the MadDad here:

http://www.hpashop.com/MadDad-EuroSp...midpipe-1m.htm

n55 should be similar, maybe a little less. They have smaler diameter pipe, but the secondary cat delete is where most of the difference is made. The MadDad's seem to help from about 3k rpm's and up. It would be nice to see some independent examples verifying this.

^^Thanks for posting that link. This kind of confirms my butt dyno in that the N55 mids while increasing mid and top end power you do loose some low end grunt in the 2K to 3K range. That was one reason why when I installed my PE I went back to N54 mids with the secondary cats.
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      08-24-2013, 11:11 PM   #119
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There is no way that could be felt or noticed as a perceivable difference....
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      08-26-2013, 04:17 PM   #120
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I don't get it. If reducing backpressure is always good on a turbocharged car then why does doing so reduce low end torque?
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      08-26-2013, 05:10 PM   #121
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Quote:
Originally Posted by TheRuss View Post
I don't get it. If reducing backpressure is always good on a turbocharged car then why does doing so reduce low end torque?
It doesn't reduce low end torque. The linked dyno graph doesn't even show this, so I don't understand why the claim is even being made.

If you rationally know something is wrong or unlikely, you most definitely should ignore people's subjective claims. (i.e. butt dynos)
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      08-27-2013, 09:12 AM   #122
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Ok, thanks for clarifying. It's not the first time I've heard such a claim, that's all. Once was even from a company that makes upgrade parts from our cars.
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      10-07-2013, 11:24 AM   #123
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Quote:
Originally Posted by TheRuss View Post
Yeah, it's an awesome sound! FWIW, I'm putting my N54 mids back on at the weekend, but that's because my car is too loud/raspy now that I have fitted AR downpipes. I really liked N55 mids with PE rear box though.
How's the sound now with the DP, n54 mids and PE??? Also, did you do de Y-Pipe? Sorry if previously stated...just found this and it's the same setup I want to run! Thanks in Advance!
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      10-11-2013, 03:36 PM   #124
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Quote:
Originally Posted by J-Rod View Post
How's the sound now with the DP, n54 mids and PE??? Also, did you do de Y-Pipe? Sorry if previously stated...just found this and it's the same setup I want to run! Thanks in Advance!
Hi there, I didn't get round to re-fitting the N54 mids. Instead I got sports cats fitted into my N55 mids for better flow. I've still not decided if I should add the y-pipe back in, so for now I'm not running it.

Car is loud on start up, then quiet in normal driving, but makes a great noise when you're on it. Sounds best in a tunnel or built up area where the sound gets reflected back! Most noticeable difference after the DPs were fitted is the turbo whistle. Can't hear it much with the windows up, but put them down and it sounds like a big rig!
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      10-11-2013, 05:15 PM   #125
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Quote:
Originally Posted by TheRuss View Post
Hi there, I didn't get round to re-fitting the N54 mids. Instead I got sports cats fitted into my N55 mids for better flow. I've still not decided if I should add the y-pipe back in, so for now I'm not running it.

Car is loud on start up, then quiet in normal driving, but makes a great noise when you're on it. Sounds best in a tunnel or built up area where the sound gets reflected back! Most noticeable difference after the DPs were fitted is the turbo whistle. Can't hear it much with the windows up, but put them down and it sounds like a big rig!
Cool, thanks. I definitely am putting dps in. And toyed around with going straight 3" all the way back. But dont want to sound like a honda at all. Saw a vw gti the other day that has a custom 3" straight done by a local muffler shop, and that thing sounds sooo good. Very deep, almost v8-like. Hard to describe really. For now im sticking by the pe, stock mids (no y-pipe though) and dps.
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      03-17-2014, 02:38 PM   #126
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*subscribed*
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      03-17-2014, 05:26 PM   #127
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Quote:
Originally Posted by J-Rod View Post
Cool, thanks. I definitely am putting dps in. And toyed around with going straight 3" all the way back. But dont want to sound like a honda at all. Saw a vw gti the other day that has a custom 3" straight done by a local muffler shop, and that thing sounds sooo good. Very deep, almost v8-like. Hard to describe really. For now im sticking by the pe, stock mids (no y-pipe though) and dps.

You really should install the y-pipe with the PE. It sounds sooo good. You will get more pops and gurgling with the y-pipe. And at WOT its sounds marvelous!!!
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      10-29-2014, 07:21 PM   #128
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for cross reference....

DIY installing N55 mid pipes on a N54...
http://www.1addicts.com/forums/showthread.php?t=800458
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