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      03-13-2009, 11:51 AM   #1
J08M3
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Secondary Cat delete only?

Has anybody done just a secondary cat delete? I've seen a few videos with resonator deletes, but none with just a cat delete. I'm sure there won't be much HP gain if any, but what does it do the sound?
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      03-13-2009, 12:08 PM   #2
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http://www.m3post.com/forums/showthread.php?t=238039


Fabspeed X-pipe. I would like to actually hear it under load, as revving in neutral is not always indicative of exhaust tone.
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      03-13-2009, 12:17 PM   #3
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but that included a resonator delete too. I'm looking to keep my resonators and delete just secondary cats
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      03-13-2009, 04:39 PM   #4
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i actually just got my car back from the exhaust shop today with a secondary cat delete and resonator delete with the stock cans on...sounds great! quiet during normal driving, but sporty when you get on it!
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      03-13-2009, 04:41 PM   #5
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Quote:
Originally Posted by Blake View Post
i actually just got my car back from the exhaust shop today with a secondary cat delete and resonator delete with the stock cans on...sounds great! quiet during normal driving, but sporty when you get on it!
did they make an x-pipe?

and any sound clips available?
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      03-13-2009, 04:43 PM   #6
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Quote:
Originally Posted by Canyon Junkie View Post
did they make an x-pipe?

and any sound clips available?
i'm running 3" tubing off the primary cats with an H-pipe on the center section. no sound clips right now, but i'll get some this weekend when it dries out a little. we've had heavy rain all week. it sounds great though, good bang for the buck.
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      03-13-2009, 04:46 PM   #7
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this is how it used to sound...same setup but with thrush mufflers on it. too loud for my tastes...

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      03-13-2009, 06:16 PM   #8
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Has anybody deleted secondary cat and left the resonators?
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      03-13-2009, 06:28 PM   #9
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Does deleting the second cat void the warranty and or throw a check engine light?




thanks
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      03-13-2009, 06:54 PM   #10
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It shouldn't since both O2 sensors are before it
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      03-13-2009, 09:42 PM   #11
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Quote:
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Does deleting the second cat void the warranty and or throw a check engine light?
no, you'll be fine.
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      03-14-2009, 11:05 AM   #12
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Blake please post a video clip. I wanna find out how the h pipe sounds
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Last edited by Bluesummer; 09-07-2011 at 06:07 AM.
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      03-14-2009, 12:41 PM   #13
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Quote:
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Blake please post a video clip. I wanna find out how the h pipe sounds
i will tomorrow, gotta get my camcorder back from a friend
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      03-14-2009, 01:27 PM   #14
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You might as well replace everything. If a primary cat goes (it was common on the E46), you're looking at:

18307840684 $3,615.29 MSRP $2,892.23 wholesale
Exhaust system - Catalytic converter
Catalytic converter, m series 2008
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      03-14-2009, 01:30 PM   #15
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Quote:
Originally Posted by jml View Post
You might as well replace everything. If a primary cat goes (it was common on the E46), you're looking at:

18307840684 $3,615.29 MSRP $2,892.23 wholesale
Exhaust system - Catalytic converter
Catalytic converter, m series 2008
?
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      03-14-2009, 01:35 PM   #16
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Quote:
Originally Posted by J08M3 View Post
?
BMW is not going to give you a new one (P/N 18307840684) if you have hacked it up, and since it's all one piece, if a cat dies, you are buying a whole new mid-section to the tune of about 3K.

You might as well replace the entire center section and add software.
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      03-14-2009, 01:37 PM   #17
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why would I want a new one from BMW???
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      03-14-2009, 01:39 PM   #18
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Because if at some point you plan to sell the car without spending some time making license plates....you are kinda going to need the original emission control system on it - no?
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      03-14-2009, 01:40 PM   #19
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Z4DAVE has done this
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      03-14-2009, 01:40 PM   #20
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no
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      03-14-2009, 01:40 PM   #21
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Quote:
Originally Posted by J08M3 View Post
no
yeah nevermind
I just saw it on youtube
that's the resonators
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      03-14-2009, 01:42 PM   #22
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Quote:
Originally Posted by McLuVan View Post
yeah nevermind
I just saw it on youtube
that's the resonators
The no was directed at the strange comment about buying a new OEM system. I'm confused to why one might have to do this, and why it would have any impact on selling the car?
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