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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > Midpipe cats deleted: 335xdrive 2011



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      06-19-2012, 11:43 PM   #1
Fredz
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Thumbs up Midpipe cats deleted: 335xdrive 2011

Hi all,

Finally, I deleted the secondary cats of my xdrive car.

I bought this car and I had always find that the exhaust note of a 335i (n55) is louder than my 335xdrive (n55).

So I do some search and find on e90post forum that 335xdrive 2011 cars have secondary cats.

335i n55
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I find this thread : http://www.m3post.com/forums/showthread.php?t=457202

...And I did like this.



I only cut the exhaust and remove the catalyst material and reinstall the exhaust.

my car
Name:  mycar.jpg
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Size:  214.5 KB

The result is good. The sound is a little more sportier and louder .... like a 335i 2011 with no secondary cat.

I don't know if I had an hp gain, but I have not find that I lose anything after one day of driving....

Took me about 2 hours for uninstall and reinstall and 30$ at a shop for welding.

Last edited by Fredz; 06-19-2012 at 11:49 PM.
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      07-12-2012, 11:21 PM   #2
elinstylez
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Looks good!
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      07-14-2012, 11:53 AM   #3
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if you removed the cat's material why didn't they just weld straight pipe?
and where is your resonator, i have resonator in the middle where the x section of yours is.
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      07-14-2012, 12:09 PM   #4
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i have a set of OEM midpipes (with cats, off an E90 335i) for sale in Toronto if anyone wants them for a project - hit me up via PM
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      07-14-2012, 12:59 PM   #5
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Quote:
Originally Posted by kavadarci View Post
if you removed the cat's material why didn't they just weld straight pipe?
and where is your resonator, i have resonator in the middle where the x section of yours is.

I only remove the mat's material because I want to keep an OEM look.

The cats are also the resonator.

What you see is an OEM exhaust sytem of 335 xdrive N55 2011.
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      07-14-2012, 01:46 PM   #6
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I like the idea but now if you need stock cats back on for some reason you will have to buy them. If you would of put strait pipe and kept the cats you would not have to buy new one if you need them.

I am suprised the shop put them on with out the insides
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      07-14-2012, 04:14 PM   #7
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Quote:
Originally Posted by obert View Post
I like the idea but now if you need stock cats back on for some reason you will have to buy them. If you would of put strait pipe and kept the cats you would not have to buy new one if you need them.

I am suprised the shop put them on with out the insides

Hi,

Yeah, a lot of shop don't want to do that, but if they just do a welding; they don't ask question....

And only 335 xDrive (N55) have secondary cats, so I don't need them because N55 335i have no secondary cats.
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      07-14-2012, 11:15 PM   #8
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Do you have a video?
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| 2015 MW F82 M4 DCT | 2011 AW E92 335i XDrive Msport 6MT Pic Thread | @Malapropism |
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      07-15-2012, 09:18 AM   #9
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Quote:
Originally Posted by Malapropism View Post
Do you have a video?

No.
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