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      12-13-2011, 07:51 PM   #1
EINSER M
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confirming the confirmed: N55 midpipes swap

yesterday took out the midpipes from the 2012 135 and swapped with the 1M. no change for the 135 but a good amount of pop and rumble for the 1M with the N55 pipes! perfect remove and bolt swap too.
highly recommended simple mod to the OEM exhaust setup!
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      12-13-2011, 08:02 PM   #2
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Quote:
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yesterday took out the midpipes from the 2012 135 and swapped with the 1M. no change for the 135 but a good amount of pop and rumble for the 1M with the N55 pipes! perfect remove and bolt swap too.
highly recommended simple mod to the OEM exhaust setup!
Can you explain more? More backfire type sounds, deeper tone, 25% louder at all speeds?
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      12-13-2011, 08:17 PM   #3
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VIDEO!
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      12-13-2011, 08:24 PM   #4
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VIDEO!
This.


Please
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      12-13-2011, 08:44 PM   #5
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VIDEO!
+1
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      12-13-2011, 08:45 PM   #6
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JUST DO IT! ok ill do my best for a vid soon
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      12-13-2011, 08:46 PM   #7
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Quote:
Originally Posted by Oaktree View Post
Can you explain more? More backfire type sounds, deeper tone, 25% louder at all speeds?
all correct!
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      12-13-2011, 08:50 PM   #8
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all correct!
So the 135i got the 1M's pipes? Maybe I should swap mine over
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      12-13-2011, 08:53 PM   #9
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Quote:
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So the 135i got the 1M's pipes? Maybe I should swap mine over
yes just make sure its a N55 car you're doing the swap with
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      12-13-2011, 09:07 PM   #10
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yes just make sure its a N55 car you're doing the swap with
Well I have my N55, with 1M coming. What did it do to the noise of the 135i... don't the 1M mids have cats?
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      12-13-2011, 09:08 PM   #11
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where can one find n55 midpipe for sale?
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      12-13-2011, 09:12 PM   #12
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.. don't the 1M mids have cats?
Yep..2 centre cats identical to the N54 135i.
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      12-13-2011, 09:15 PM   #13
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Yep..2 centre cats identical to the N54 135i.
So adding 2ndry cats to the N55 can't be a good thing?
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      12-13-2011, 09:37 PM   #14
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So adding 2ndry cats to the N55 can't be a good thing?
I can't imagine it is.
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      12-13-2011, 10:32 PM   #15
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JUST DO IT! ok ill do my best for a vid soon
hahaha convinced yourself in mid sentence??
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      12-13-2011, 10:40 PM   #16
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Quote:
Originally Posted by ianf View Post
Well I have my N55, with 1M coming. What did it do to the noise of the 135i... don't the 1M mids have cats?
135 was fine, ill drive it more extensively this weekend to see if it negatively affected it
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      12-13-2011, 10:41 PM   #17
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Quote:
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So adding 2ndry cats to the N55 can't be a good thing?
quoting samleeyy, itll make the N55 135 a SUPER GREEN car
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      12-14-2011, 01:04 AM   #18
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So you still have the downpipe cats correct? Wonder if it still passes emissions...
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      12-14-2011, 03:10 AM   #19
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So you still have the downpipe cats correct? Wonder if it still passes emissions...
yes correct. exhaust fumes do smell different now but nothing too obnoxious. its my understanding with these midpipes the car will still pass emissions
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      12-14-2011, 03:19 AM   #20
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its my understanding with these midpipes the car will still pass emissions
Ahhhh.. Don't think so.. that's why the 1M ( N54 ) has mid cats OEM..

And the 135i ( N55 ) has no mid cats..different emissions for different engines..
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      12-14-2011, 12:23 PM   #21
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The secondary cats are required to keep the vehicle emissions in check while the diagnostic is run on the rear O2 sensor. This is required each drive cycle, where the ECU modifies the fuel air mixture into a region that makes the primary cats less effective in reducing emissions. I believe this revised diagnostic was implemented in 2010 regulations.

Once the diagnostic is complete, the primary cats are sufficient to meet emissions. Since this diagnostic will likely complete within the first few minutes of a drive cycle, you should have no problem passing a smog check, based on emissions measured.
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      12-14-2011, 01:51 PM   #22
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The N55 primary cat should have been designed with the rear O2 sensor integrated mid length so it can complete its diagnostic without the use of a secondary cat.
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