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      10-01-2011, 09:21 PM   #1
javol
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Secondary CATS delete - WOW!

Removed this mornig the secondary cat and... WOW!!
The sound is incredible!!
Especially the loud "TUM" on upshifting is gorgeous!!
A greet modify for 80 $.
I could not pare to drive and drive around , listening to the upshift sound!!!
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      10-01-2011, 10:39 PM   #2
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NEED SOUND VID!!!

Does it smell bad after taking it out?
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      10-02-2011, 12:09 PM   #3
///NWIE89
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please get a video of this!
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      10-02-2011, 08:15 PM   #4
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Quote:
Originally Posted by ///NWIE89 View Post
please get a video of this!
Here we are :

1) on board video at:


2) gentle take off at:


Car is brand new (200 km), i shift @ 4000 RPM.

Completely stock except for secondary cats.

The exhaust tips are 4" applied to the oem mufflers, no more than that.

Bye!
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      10-03-2011, 01:38 AM   #5
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Quote:
Originally Posted by javol View Post
Here we are :

1) on board video at:


2) gentle take off at:


Car is brand new (200 km), i shift @ 4000 RPM.

Completely stock except for secondary cats.

The exhaust tips are 4" applied to the oem mufflers, no more than that.

Bye!
Thanks for the vid!

Is the sound louder in general or just different when you upshifting?
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      10-03-2011, 07:53 AM   #6
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It is a bit louder in general, you can ear it in my 2nd video.
Just perfect for my taste.
But the best is the "bluuurrpppp" on upshifting and the rumbling on downshifting!
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      10-03-2011, 02:13 PM   #7
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Now you got me thinking about doing the same. Is there any power loss to this? Also can you put it back incase for inspection?
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      10-03-2011, 07:38 PM   #8
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Quote:
Originally Posted by sDrive35i View Post
Now you got me thinking about doing the same. Is there any power loss to this? Also can you put it back incase for inspection?
No power loss at all.

For what concern "putting back" is tedious, not impossible.

It is a cut and weld work.
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      10-14-2011, 11:02 PM   #9
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Quote:
Originally Posted by javol View Post
No power loss at all.

For what concern "putting back" is tedious, not impossible.

It is a cut and weld work.
Any warranty issues?

Sorry for the stupid question but how do you do it?
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      10-16-2011, 10:19 AM   #10
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Very Simple You Have To Cut At Each End Of The Cat Whit A Sawsall And Replace It Whit Straight Pipe
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      10-18-2011, 01:02 PM   #11
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sounds great
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      10-23-2011, 08:23 AM   #12
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do you get any problems with the computer system ?? like engine check or an other problems ??
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      10-23-2011, 07:27 PM   #13
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Quote:
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do you get any problems with the computer system ?? like engine check or an other problems ??
No problems at all.
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      06-11-2012, 08:49 AM   #14
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hi Javol

More than half a year has passed, was wondering if you still enjoy this mod?
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Little known facts about BMW: 1) The N54 is still in production and used in the current Z4 35i and 35is. 2) In a Z4 you can get sport+ steering combined with normal suspension etc by selecting DSC=off. (Update: DSC=off also offers sports steering in the M135i) 3) All Z4s with 19" wheels are still only offered with the worst performing OEM tires ever sold with a DCT equipped BMW (Potenza RE 050 RFT).
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      06-16-2012, 01:06 PM   #15
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Quote:
Originally Posted by Asbjørn View Post
hi Javol

More than half a year has passed, was wondering if you still enjoy this mod?
Completely
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      08-14-2012, 10:56 AM   #16
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Sorry if this is a stupid question but what's the difference between the secondary cats and the first cats?
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      08-14-2012, 08:41 PM   #17
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Quote:
Originally Posted by ymdd View Post
Sorry if this is a stupid question but what's the difference between the secondary cats and the first cats?
In the N54 engine, the 2 primary cats are part of the downpipes, hence are practically located at 15-20 cm from the turbos. They are the most effective in reducing emissions and the most restrictive in term of exhaust flow, quitting power and torque. Removing the primary cats gan give you aprox 20-30 whp, depending on the chip tuning you run, and less turbo lag. The secondary cats are located aprox in the center of the car, welded to the midpipes. Removing them does NOT improve power and torque nor reduce turbo lag. Probably the emissions increase and it depends on how much severe are the laws where you live to go with this mod or not. For what concern the Z4 35i, I think this is the best mod to have a louder sound and an amplified upshift "TUM" @ very low cost, at least in Italy.
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      08-19-2012, 10:50 AM   #18
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What about the iS?
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      08-19-2012, 02:39 PM   #19
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Quote:
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What about the iS?
35i and 35is share the same exhaust parts and layout except for the rear end mufflers, sligthly different. This mod should give the same sound increase in both models.
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      10-01-2012, 06:35 AM   #20
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i am thinking to do it on my z4 20i but i am curious about if there will be any error on screen ?

and i dont know how many cats does 20i ( n20 engine ) have
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      10-01-2012, 11:03 AM   #21
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Quote:
Originally Posted by castilla View Post
i am thinking to do it on my z4 20i but i am curious about if there will be any error on screen ?

and i dont know how many cats does 20i ( n20 engine ) have
Here http://www.realoem.com/bmw/ you will find everything about your car
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      10-01-2012, 01:18 PM   #22
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okay thanks but any ideas about error ? when i delete cat maybe some sensors will not work properly and it cause error on screen
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