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      04-11-2011, 12:44 AM   #1
Elsabor67
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2009 135i  [5.00]
BT Street Performance Exhaust and N55 Midpipes

The latest and greatest. I got the midpipes from E46M3to335i about a month ago and finally installed them on saturday. Nice startup and mellow sound. Also a nice difference that eliminating secondary cats can do. You can definetly feel a little better breathing. Pics will come this evening but for now, a small startup clip

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      04-11-2011, 03:42 AM   #2
FDM68
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Nice sound.
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      04-11-2011, 03:56 AM   #3
Dackelone
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Nice Nick. I gotta install mine. I think installing the N55 center section exhaust pipe has gotta be good for the sound AND throttle response. Do you notice less turbo lag? Or can you hear your turbos more now?


Here is my N55 mid pipe...
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      04-11-2011, 07:29 AM   #4
Elsabor67
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Quote:
Originally Posted by Dackelone View Post
Nice Nick. I gotta install mine. I think installing the N55 center section exhaust pipe has gotta be good for the sound AND throttle response. Do you notice less turbo lag? Or can you hear your turbos more now?


Here is my N55 mid pipe...
I am gonna do some recording at speeds and WOT today after work. I can definetly hear the turbos more and ALOT less turbo lag. I will have some pics of the install today.
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      04-11-2011, 03:49 PM   #5
Elsabor67
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As promised, here are some pics when I swapped the mids out.

Always make sure that you purchase a new set of bolts, nuts and gaskets just in case




Removing the mids is easy. A total of 7 bolts/nuts and that is it. 2 are 17/19mm rear, torx socket for the middle hanger and 12mm for the DP bolts. make sure you use a decent breaker bar cause they will be hard to remove.

Also, even though on the pics the N55's look longer than the N54 mids, they fit with no issues



Final result


They are lighter than the N54 mids

Also, a look inside one of the cats.......how does exhaust go through there??
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      04-11-2011, 03:57 PM   #6
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Nice pics Nick.

Here is a shot of the inside of the N55 resonator (straight thru) brand new with no carbon.

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      04-13-2011, 07:06 AM   #7
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The suggestion with the N55 mid-pipes comes from me! I told that e46M3to335!! :-))

Regards
Babyjoe
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      05-03-2011, 02:54 PM   #8
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Very nice sound

I will put a double pipe pointer in my now, and I'm wondering if I that the cats out or not
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