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Removed my E46 330i cats recently
23-02-2017, 07:05 PM
Post: #1
Removed my E46 330i cats recently
AS above, just removed the ones under the car, they fitted a resonator box in place of both cats, not sure if I'm that happy, sound has changed, a bit more muted, not that growl the 330i is known for.....performance, feels a bit nippier, seems to rev a bit cleaner, and I think my fuel consumption has improved a bit....not sure if I want to remove the header cats, would be nice to get a complete replacement header that has been de-catted....
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23-02-2017, 08:45 PM
Post: #2
RE: Removed my E46 330i cats recently
I have removed both sets of cats in my 2001 330i. The header cats I removed from the car and then had an exhaust company insert straight pipe as a replacement. The same method was used for the secondary cats. The car still has a deep growl and sounds absolutely awesome on cold start-up. Other than that, it's as smooth and refined as a BMW 6 cylinder should sound. Definitely better throttle response and it feels a tiny bit stronger.

Current:
2001 BMW E46 330i Titanium Silver (See Here )
In Progress:
BMW K75 Café Racer (See Here)
Previous:
1991 BMW E34 520i Calypso Red
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23-02-2017, 09:18 PM
Post: #3
RE: Removed my E46 330i cats recently
I removed the bottom ones too, but replaced them with straight pipes.

@ Kurt - you removed both sets and replaced both sets with straight pipes
no resonators / boxes in place of these 4 cats ?

And you don't have any droning ?
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23-02-2017, 09:29 PM
Post: #4
RE: Removed my E46 330i cats recently
To all that have decatted their 330i's, what did you do in order to not have a check engine light appear?

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Current:

2000 E46 330ci Topaz Blau
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24-02-2017, 05:50 AM
Post: #5
RE: Removed my E46 330i cats recently
Decatting a e46 330i will not cause a EML light.

1993 E36 328i Sedan

2005 E46 330i Touring

Old BMWs never die, they just get faster!
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[-] The following 1 user says Thank You to Gizmo@GARAGE46 for this post:
Serg_ZA (02-24-2017)
24-02-2017, 10:25 PM
Post: #6
RE: Removed my E46 330i cats recently
(24-02-2017 05:50 AM)Gizmo@GARAGE46 Wrote:  Decatting a e46 330i will not cause a EML light.

Thanks for clearing that up haha. Anyone have a 328i manifold for me? Tiptoe

Current:

2000 E46 330ci Topaz Blau
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25-02-2017, 06:57 PM (This post was last modified: 25-02-2017 07:00 PM by stevehampshire39.)
Post: #7
RE: Removed my E46 330i cats recently
Just got a motor out of a 2000 but the motor caught fire not burnt super bad just melted plastics.

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So not sure anout the manifold

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(25-02-2017 06:57 PM)stevehampshire39 Wrote:  Just got a motor out of a 2000 but the motor caught fire not burnt super bad just melted plastics.

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So not sure anout the manifold

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25-02-2017, 07:06 PM
Post: #8
RE: Removed my E46 330i cats recently
(25-02-2017 06:57 PM)stevehampshire39 Wrote:  Just got a motor out of a 2000 but the motor caught fire not burnt super bad just melted plastics.

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So not sure anout the manifold

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(25-02-2017 06:57 PM)stevehampshire39 Wrote:  Just got a motor out of a 2000 but the motor caught fire not burnt super bad just melted plastics.

Sent from my LGL43AL using Tapatalk

So not sure anout the manifold

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PM me

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Current:

2000 E46 330ci Topaz Blau
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25-02-2017, 07:43 PM
Post: #9
RE: Removed my E46 330i cats recently
Steve, I have a spare 330i intake manifold if needed. PM me.

1993 E36 328i Sedan

2005 E46 330i Touring

Old BMWs never die, they just get faster!
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27-02-2017, 12:04 PM
Post: #10
RE: Removed my E46 330i cats recently
I have a 2004 330i and about a month ago I decided to do a full decat and stainless steal exhaust - it sounds amazing. I went the straight pipe route with replacing the cats and 2 performance boxes.

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01-03-2017, 02:53 PM
Post: #11
RE: Removed my E46 330i cats recently
(23-02-2017 09:18 PM)Charlie Brown Wrote:  I removed the bottom ones too, but replaced them with straight pipes.

@ Kurt - you removed both sets and replaced both sets with straight pipes
no resonators / boxes in place of these 4 cats ?

And you don't have any droning ?


They fitted a 2 in - 2 out box in place of the 2 cats, common entity between the 2 pipes now....was considering just straight pipes, no resonator box, but heard members say it was very noisy, will rethink this....dunno if I'm happy with the sound now, sounds to much like a 325.....
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02-03-2017, 04:57 PM (This post was last modified: 02-03-2017 04:58 PM by GPGrobler.)
Post: #12
RE: Removed my E46 330i cats recently
Mine not a lot louder since removing the exhaust cats just a very nice additional low bass rumble at idle, removing the header cats next week and adding the resonators ... can't wait!!! Tiptoe

BMW E30 318i 1990, BMW E30 318i ///M Tech 1989, BMW E46 320i 2002
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07-03-2017, 03:25 PM
Post: #13
RE: Removed my E46 330i cats recently
Ok, so today I had that horrible baffle removed, straight pipes fitted now where the underbody cats were, much better, and not too noisy, should have done this in the first place...but, when I checked out the workmanship on this baffle, not good, wrong diameter pipes used, 50mm instead of 45mm on the one side, and check out the pic, much smaller working diameter because of the crappy welding....[Image: zorst...._5458377874.jpg]
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07-03-2017, 05:08 PM
Post: #14
RE: Removed my E46 330i cats recently
Grass-fit?

1993 E36 328i Sedan

2005 E46 330i Touring

Old BMWs never die, they just get faster!
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08-03-2017, 07:51 AM
Post: #15
RE: Removed my E46 330i cats recently
(07-03-2017 05:08 PM)Gizmo@GARAGE46 Wrote:  Grass-fit?


Nope, the guys in Alberton North, Quick-fit I think, red logo/paint-scheme above the shop.
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