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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Secondary cat delete??????



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      06-29-2012, 03:10 PM   #1
E90ROXS
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Secondary cat delete??????

Thinking of removing the second cat on my car. The guy at the muffler shop told me he would do it but i might run into trouble with the smog shop. I know some of you are running without the 2nd cat. How did you pass smog check? By the is $250 a reasonable price to remove the cat?
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      06-29-2012, 03:14 PM   #2
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$250 is not reasonable at all.. I recall a local shop quoting $100.
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      06-29-2012, 03:24 PM   #3
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I was quoted 180.
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      06-29-2012, 11:00 PM   #4
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If your state still does the sniff test in the tailpipe there is a slight chance you will fail the physical test and sniff test (although not 100% either way honestly). When I lived in Dallas they were strict on the test and I had to pay $1200 for a new exhaust setup for a truck I had at the time. (catless headers and strait dumped before the end of the cab, which is against TX law)

If they only do the scan of the OBDII, there is a good chance they wont do a physical inspection since you will not fail that test.

I dunno dude...You may want to read up on what your state does.
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      06-30-2012, 12:39 AM   #5
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$250 for e90 sounds outrageous. Also wondering about the smog tests and such, interested in deleting mine as well.
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      06-30-2012, 12:41 AM   #6
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got mine done for 65$ lol rip off
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      06-30-2012, 01:06 AM   #7
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Quote:
Originally Posted by ramirez330i View Post
$250 for e90 sounds outrageous. Also wondering about the smog tests and such, interested in deleting mine as well.
your safe your rear o2s are befor the 2ndary cats as for smog goes u wont smell nothing an u will still be safe for inspections
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      06-30-2012, 02:28 AM   #8
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Thanks for the feedback guys. I'll take djapex's words and will get it done this weekend but not for $250 though lol. By the way, does it really change the exhaust note without the second cat? I'm doing this for the sound.
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      06-30-2012, 03:39 AM   #9
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Originally Posted by E90ROXS View Post
Thanks for the feedback guys. I'll take djapex's words and will get it done this weekend but not for $250 though lol. By the way, does it really change the exhaust note without the second cat? I'm doing this for the sound.
watch some youtube clips. imo it does change it a bit. but it also reduces your launching power more so, i believe.
no good, especially with underdog 325i.
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      06-30-2012, 04:10 AM   #10
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If I go wheel and meals on Sunday before work, you can hear my set up. And yes low end torque is a bit with my straight pipes. I think it's because my pipes are pretty much 3 inch instead of 2 or 2 1/2 inches

I plan to change this with Apex wheels and AA tune to get better acceleration, car feels heavy right now.
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      06-30-2012, 04:36 AM   #11
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I plan to change this with Apex wheels and AA tune to get better acceleration, car feels heavy right now.

AA on sale at SV concepts and AA with a special sale of their own up til 4july.

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      06-30-2012, 04:51 AM   #12
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AA on sale at SV concepts and AA with a special sale of their own up til 4july.

I know but I want my CPO to end next year because I want my water pump, thermostat, sparks, coil packs, battery all to die and get brand new, since some of those things give the tune hiccups but it's hit or miss on the car.

It's the same deal last year, it'll happen again next year.
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      06-30-2012, 11:52 AM   #13
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Best bet if you get physical inspections along with obd testing is to get a flange set up put in place of the cats so you can swap them back and forth yourself. A little more expensive up front but you will end up paying down the line if you have visual inspection to deal with.
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      06-30-2012, 12:25 PM   #14
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Quote:
Originally Posted by E90ROXS View Post
Thanks for the feedback guys. I'll take djapex's words and will get it done this weekend but not for $250 though lol. By the way, does it really change the exhaust note without the second cat? I'm doing this for the sound.
when i had my muffler delete and i still had my res and i deleted my 2ndary cats the exhaust note did get deeper and i got more rumbles/backfire at low end. Heres a vid say thanks to chris cause ive yet to see a good exhaust vid!

Mines the 2nd car
muffler delete, res still there, ad 2ndary cat delete
Must watch in HD to really hear it
http://youtu.be/0ZZQyPcV_UA?hd=1
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      06-30-2012, 01:31 PM   #15
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Quote:
Originally Posted by DJ Apex View Post
when i had my muffler delete and i still had my res and i deleted my 2ndary cats the exhaust note did get deeper and i got more rumbles/backfire at low end. Heres a vid say thanks to chris cause ive yet to see a good exhaust vid!

Mines the 2nd car
muffler delete, res still there, ad 2ndary cat delete
Must watch in HD to really hear it
http://youtu.be/0ZZQyPcV_UA?hd=1

oh this was yours? nice. actually i remember "liking" this video a while back and saved it. top 3 video on youtube that had a side by side comparison and should get more attention imo.

btw who had the magnaflow exhaust? his cats and res was not removed?



Last edited by tororosso1; 06-30-2012 at 01:43 PM.
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      06-30-2012, 01:56 PM   #16
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Quote:
Originally Posted by tororosso1 View Post
oh this was yours? nice. actually i remember "liking" this video a while back and saved it. top 3 video on youtube that had a side by side comparison and should get more attention imo.

btw who had the magnaflow exhaust? his cats and res was not removed?


That's the hole magnaflo exhaust system from magnaflow so it keeps 2ndary cats and deletes res. if I'm correct he still had 2ndard cats in place
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      11-17-2012, 01:36 AM   #17
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I finally got it done today. 2nd cats are out! the car sounds incredible. When they cut out the mid pipe section (muffler was disconnected), I turned on the car and rev a few times just to witness how a muffler delete sound like. It sounded like a tank. If I had an american muscle car then I would do a muffler delete because it doesn't sound right on a bimmer. Back to the 2nd cats delete. The muffler gargle and pops more now. There is a tad bit of drone around 2K RPM but bearable. However I don't notice any drone when the car is in DS mode. As for loudness, maybe 5% louder. However the exhaust note changed. It has a warm throaty and gargle sound. Overall I'm very satisfied with this mod. Would I recommend this mod? Hell yeah! Here is my setup: afe magnum force intake, secondary cats delete, resonator delete, remus powersound (quad).
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      11-17-2012, 02:17 AM   #18
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I finally got it done today. 2nd cats are out! the car sounds incredible. When they cut out the mid pipe section (muffler was disconnected), I turned on the car and rev a few times just to witness how a muffler delete sound like. It sounded like a tank. If I had an american muscle car then I would do a muffler delete because it doesn't sound right on a bimmer. Back to the 2nd cats delete. The muffler gargle and pops more now. There is a tad bit of drone around 2K RPM but bearable. However I don't notice any drone when the car is in DS mode. As for loudness, maybe 5% louder. However the exhaust note changed. It has a warm throaty and gargle sound. Overall I'm very satisfied with this mod. Would I recommend this mod? Hell yeah! Here is my setup: afe magnum force intake, secondary cats delete, resonator delete, remus powersound (quad).
Where didu get your diffuser and trunk?
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      11-17-2012, 02:32 AM   #19
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Where didu get your diffuser and trunk?
bimmerkit.com

email them and bargain for 10% discount
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      11-17-2012, 01:31 PM   #20
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Welcome to the club did you delete the resonator as well?
The only thing id have to say worry about is if you delete your primary cats on the headers, expect soot to shoot out and cover your rear end. Sometimes flames may occur if you're driving hard enough and if your car is extremely hot. My case was I pumped a full tank of 110 oct. Lol I highly don't recommend it
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      11-18-2012, 04:10 PM   #21
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Flame? Wow hope i wont run into this problem lol. Cold start sounds so nice. Im planning to have clean mid pipe because mine has 2 welded spots where the cats and resonator used to be at. It just doesnt look clean.
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      11-19-2012, 12:21 PM   #22
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Have it welded by Leo at detail addict, he tig welded my pipes really clean. And ask him about his midpipes with magnaflow muffler. Your jaws will drop if you drive with it.
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