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      06-20-2012, 12:43 AM   #1
Fredz's Avatar

Drives: 335i xDrive 2011
Join Date: Mar 2011
Location: Montreal

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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 :

...And I did like this.

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

my car
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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; 06-20-2012 at 12:49 AM.