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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Secondary Cat Delete



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      04-06-2011, 10:29 PM   #1
SuperBmw
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Secondary Cat Delete

I've been looking to get a bit more sound out of my exhaust and I noted that a muffler delete was just way too much for me. I would go catless DP's, but then I'd have issues during emissions testing.

So I was wondering what everyone felt about getting a 2nd cat delete for sound? It's gonna cost me about $135.... is it worth the cost? I searched around and the performance gains seem to be negligible.

I'm just looking for a louder and deeper note to my exhaust without having to go aftermarket.
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      04-06-2011, 10:31 PM   #2
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i wondered the same thing too, but I believe that secondary cats may also effect emission if your primary cats fail
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      04-06-2011, 10:31 PM   #3
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you dont care about emissions but what about your warranty?
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      04-07-2011, 05:29 AM   #4
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Here is a thread I created which should help you decide

http://www.e90post.com/forums/showthread.php?t=509180
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      04-07-2011, 05:33 AM   #5
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more response, faster and more audible turbo spool. increase in 5-10 rwhp, all for $135. whats not to like! oh right, forgot the most important factor. the sound is awesome. it now gurgles and is throatier.
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      04-07-2011, 08:52 AM   #6
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Quote:
Originally Posted by SuperBmw View Post
I've been looking to get a bit more sound out of my exhaust and I noted that a muffler delete was just way too much for me. I would go catless DP's, but then I'd have issues during emissions testing.

So I was wondering what everyone felt about getting a 2nd cat delete for sound? It's gonna cost me about $135.... is it worth the cost? I searched around and the performance gains seem to be negligible.

I'm just looking for a louder and deeper note to my exhaust without having to go aftermarket.
Plan on getting some resonators to replace them. It'll sound very raspy without the cats
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      06-17-2011, 02:50 AM   #7
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do it!
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      06-10-2012, 10:18 PM   #8
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      06-10-2012, 10:30 PM   #9
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ull see/smell some more smoke too
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      06-10-2012, 11:11 PM   #10
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Are you sure you guys are talking about a second cat delete? It sounds like you guys are talking about what will happen with DPs
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      06-10-2012, 11:28 PM   #11
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Quote:
Originally Posted by E90Company View Post
Are you sure you guys are talking about a second cat delete? It sounds like you guys are talking about what will happen with DPs
Yup. It's similar just more noticeable going from catless dp to no secondary cat
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      06-10-2012, 11:32 PM   #12
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I (no I did NOT) and like the results. Do it

Last edited by Joshboody; 08-02-2012 at 10:42 AM.
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      06-10-2012, 11:35 PM   #13
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talk about a zombie thread. This is over a year old but still useful info.
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      06-11-2012, 11:52 AM   #14
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Lol $135 i got my secondaries cut for 50 with stainless steel your getting ripped off
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      06-11-2012, 12:05 PM   #15
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I have that same setup. You will have a raspy sound right in betwen 1600/1700 to 2000 rpms. You are going to change your driving style 2000rpms and up. I have and 6mt though. Beside that you will like it.
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      06-26-2012, 11:01 AM   #16
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is there an actual performance gain with the secondary cats delete with a tune such as JB3?
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      06-26-2012, 01:15 PM   #17
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Yup, nothing really noticable but I'm sure it has to be good for a few hp.

Got mine done for free pretty much. Traded the cats out for the work. Our secondary cats are worth about 80 to the junkers
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      06-26-2012, 11:35 PM   #18
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Check my video/thread. I just ordered res vibrant 2x well c how it sounds
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      08-02-2012, 10:10 AM   #19
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Well after asking around a few local shops here in the good ol' state of NC ( by god). I found that it is illegal and also a felony if caught by the EPA if you remove your secondary cats.
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      08-02-2012, 10:29 AM   #20
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yeah, most states are similar I think. Remove the exhaust first... not on the car different story. And gut them for stealth.

Last edited by Joshboody; 08-02-2012 at 10:41 AM.
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      08-02-2012, 10:59 AM   #21
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I did the catless downpipes and 2nd cat delete. The car sounds great.
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      03-27-2018, 11:57 AM   #22
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What's guys. Anybody in the Raleigh area with careless dp and 2nd cat delete?
Please
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