Secondary cats removal 2005 325i

nam71594 · 03-01-2011, 06:22 PM

hey guys, i was thinking about removing my secondary cats and go right to straights and i was wondering if there is some kind of sensor attached to it and if there is, how would i remove it if i could and if not, how would i rewire so it doesnt beep?

Got Euro ? · 03-01-2011, 06:59 PM

secondary cats you can get rid of, they dont do nothing, its the primary cats that have 02 sensors on them that will throw a CEL unless you do the 02 sims..

nam71594 · 03-01-2011, 07:42 PM

so basically if i get the 02 sims it should stop the beeping and the engine check light, right?

Wlew · 03-01-2011, 07:53 PM

your asking two different things. you can remove your 2nd cats with no problems. If you delete your PRIMARY cats....then you will need some o2 sims.

nam71594 · 03-01-2011, 08:00 PM

ohh alright i get what youre saying! ahha took a little while to figure all of it out. thank you!

AlpineSwift · 03-01-2011, 11:29 PM

Kinda hard to delete the primaries without either custom work or new headers.

guerilla twang · 03-02-2011, 08:38 AM

Quote:

Originally Posted by AlpineSwift

Kinda hard to delete the primaries without either an insane amount of custom work or new headers.

Fixed.

nam71594 · 03-02-2011, 09:57 AM

by insane, you mean like straight piping, because thats what im planning to do, but first i am getting Supersprint headers, so im not sure if that will delete the primary and if it does ill get some o2 sensors.

jfisher160 · 03-02-2011, 04:41 PM

Quote:

Originally Posted by nam71594

by insane, you mean like straight piping, because thats what im planning to do, but first i am getting Supersprint headers, so im not sure if that will delete the primary and if it does ill get some o2 sensors.

If you need help with this I would ask Gavin, he did all this to his car. I know he was running Headers with no cats, straight pipe with resonator and no muffler I believe.

sk8board511 · 03-02-2011, 05:14 PM

+1 Gavin is the NA e90 god

Got Euro ? · 03-02-2011, 07:05 PM

Ok wow its not insane work to delete your primAry cats , if you think its too much work then you obv never really have modded a car lol .. you can have a shop make you some nice custom flanged stainless steel tubing , and throw in your o2 sims , done ..

NickLee · 03-03-2011, 01:15 AM

this can work i think
http://www.bigdaddiesgarage.com/?gcl...FRxqgwod5BsdGg

AlpineSwift · 03-03-2011, 08:42 AM

Quote:

Originally Posted by NickLee

this can work i think
http://www.bigdaddiesgarage.com/?gcl...FRxqgwod5BsdGg

Looks like something homedepot would carry. No thanks.

Got Euro ? · 03-03-2011, 09:21 AM

Well an 02 sim is actually just a nut that's extended to push your 02s out farther but still be able to read the incoming mixture and not throw a CEL .

nam71594 · 03-03-2011, 09:24 AM

Quote:

Originally Posted by NickLee

this can work i think
http://www.bigdaddiesgarage.com/?gcl...FRxqgwod5BsdGg

thanks!

nam71594 · 03-03-2011, 09:26 AM

Quote:

Originally Posted by Got Euro ?

Ok wow its not insane work to delete your primAry cats , if you think its too much work then you obv never really have modded a car lol .. you can have a shop make you some nice custom flanged stainless steel tubing , and throw in your o2 sims , done ..

yeah doesnt look too much, in your perspective, im planning on just straight piping the whole car. most fab shops should do that cuhs its just removal and replacing with piping.

Wlew · 03-03-2011, 11:18 AM

be careful with primary removal yall. I dont know what the laws are from state to state, but most of them here in the south you will fail inspection without primary cats...even with o2 sensors.

something to be considered.

nam71594 · 03-03-2011, 01:34 PM

Quote:

Originally Posted by Wlew

be careful with primary removal yall. I dont know what the laws are from state to state, but most of them here in the south you will fail inspection without primary cats...even with o2 sensors.

something to be considered.

im in LA

BudVlad · 03-04-2011, 07:51 AM

My solution to secondary cat removal – Supersprint:

guerilla twang · 03-04-2011, 10:40 AM

Why in God's name would you hack up the stock manifold when you could just get real headers? I realize that this is what OP is doing, but having some effin' jimmy rig is trash. It's a BMW, hack jobs are for Hondas.

Pierre1014 · 11-18-2013, 01:16 PM

I'm thinking about doing a primary cat delete on my 325i e90... After I cleared up the engine light I shouldn't have any problem passing an inspection right ?

GStar1 · 11-18-2013, 01:19 PM

Quote:

Originally Posted by Pierre1014

I'm thinking about doing a primary cat delete on my 325i e90... After I cleared up the engine light I shouldn't have any problem passing an inspection right ?

false, without sim's the light will come back on....

and technically, you shouldn't pass an inspection at all, because part of every inspection is a visual inspection, and no primary cat (with sim or not) is a FAIL

03-01-2011, 06:22 PM	#1
nam71594 Private 14 Rep 77 Posts Drives: BMW 325i Join Date: Feb 2011 Location: Arcadia iTrader: (0) Garage List 2008 M3 [0.00] 2006 325i [0.00]	Secondary cats removal 2005 325i hey guys, i was thinking about removing my secondary cats and go right to straights and i was wondering if there is some kind of sensor attached to it and if there is, how would i remove it if i could and if not, how would i rewire so it doesnt beep? __________________ weeeee vroom vroom!
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03-01-2011, 06:59 PM	#2
Got Euro ? Here Comes The Boom 21 Rep 493 Posts Drives: e92 Join Date: Feb 2011 Location: NNJ iTrader: (1)	secondary cats you can get rid of, they dont do nothing, its the primary cats that have 02 sensors on them that will throw a CEL unless you do the 02 sims.. __________________ ▀▄▀▄▀▄// DTMPOWER //
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03-01-2011, 07:42 PM	#3
nam71594 Private 14 Rep 77 Posts Drives: BMW 325i Join Date: Feb 2011 Location: Arcadia iTrader: (0) Garage List 2008 M3 [0.00] 2006 325i [0.00]	so basically if i get the 02 sims it should stop the beeping and the engine check light, right? __________________ weeeee vroom vroom!
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03-01-2011, 07:53 PM	#4
Wlew Major 77 Rep 1,116 Posts Drives: 2011 E90 335i Join Date: Sep 2009 Location: Washington, DC iTrader: (12)	your asking two different things. you can remove your 2nd cats with no problems. If you delete your PRIMARY cats....then you will need some o2 sims. __________________ 2011 335i Sports Package \| VRSF FMIC \| Cobb AP3 \| Dinan Exhaust \| BMS Intake \| VRSF CP \| Lux H8 Angel Eyes \| Mtec LED Fogs \|
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03-01-2011, 08:00 PM	#5
nam71594 Private 14 Rep 77 Posts Drives: BMW 325i Join Date: Feb 2011 Location: Arcadia iTrader: (0) Garage List 2008 M3 [0.00] 2006 325i [0.00]	ohh alright i get what youre saying! ahha took a little while to figure all of it out. thank you! __________________ weeeee vroom vroom!
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03-01-2011, 11:29 PM	#6
AlpineSwift Colonel 77 Rep 2,114 Posts Drives: 2008 335Xi Coupé Join Date: Feb 2010 Location: Castle Rock, CO iTrader: (3)	Kinda hard to delete the primaries without either custom work or new headers. __________________ E92 '08 335Xi 6AT - Cobb AP3 Tuned by MAC Autosport, Original Prototype Xi DOCRace 6266 Single Turbo Swap, VRSF CP w/Synapse BOV, VRSF 7" FMIC, BMS Cowl, H&R Coilovers, Renn Motorsport RS-51's, Stoptech Stage 2 Slotted, xHP Stage 3, Earl's Racing Oil Cooler, Turner Boost Gauge, M3 Lip Spoiler. Standing Mile Record Holder for Xi over a mile high: 168.2MPH @ 5512'; The Colorado Mile hosted by The US Mile.
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03-02-2011, 09:57 AM	#8
nam71594 Private 14 Rep 77 Posts Drives: BMW 325i Join Date: Feb 2011 Location: Arcadia iTrader: (0) Garage List 2008 M3 [0.00] 2006 325i [0.00]	by insane, you mean like straight piping, because thats what im planning to do, but first i am getting Supersprint headers, so im not sure if that will delete the primary and if it does ill get some o2 sensors. __________________ weeeee vroom vroom!
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03-02-2011, 05:14 PM	#10
sk8board511 Captain 48 Rep 689 Posts Drives: 07 E90-Bikes on bikes on bikes Join Date: Feb 2010 Location: Charlotte NC iTrader: (0)	+1 Gavin is the NA e90 god __________________ KING"ish" OF Changed for collins
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03-02-2011, 07:05 PM	#11
Got Euro ? Here Comes The Boom 21 Rep 493 Posts Drives: e92 Join Date: Feb 2011 Location: NNJ iTrader: (1)	Ok wow its not insane work to delete your primAry cats , if you think its too much work then you obv never really have modded a car lol .. you can have a shop make you some nice custom flanged stainless steel tubing , and throw in your o2 sims , done .. __________________ ▀▄▀▄▀▄// DTMPOWER //
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03-03-2011, 01:15 AM	#12
NickLee Private 2 Rep 64 Posts Drives: E90 330i Join Date: Oct 2008 Location: vancouver iTrader: (0)	this can work i think http://www.bigdaddiesgarage.com/?gcl...FRxqgwod5BsdGg
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03-03-2011, 09:21 AM	#14
Got Euro ? Here Comes The Boom 21 Rep 493 Posts Drives: e92 Join Date: Feb 2011 Location: NNJ iTrader: (1)	Well an 02 sim is actually just a nut that's extended to push your 02s out farther but still be able to read the incoming mixture and not throw a CEL . __________________ ▀▄▀▄▀▄// DTMPOWER //
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03-03-2011, 11:18 AM	#17
Wlew Major 77 Rep 1,116 Posts Drives: 2011 E90 335i Join Date: Sep 2009 Location: Washington, DC iTrader: (12)	be careful with primary removal yall. I dont know what the laws are from state to state, but most of them here in the south you will fail inspection without primary cats...even with o2 sensors. something to be considered. __________________ 2011 335i Sports Package \| VRSF FMIC \| Cobb AP3 \| Dinan Exhaust \| BMS Intake \| VRSF CP \| Lux H8 Angel Eyes \| Mtec LED Fogs \|
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03-04-2011, 07:51 AM	#19
BudVlad Old Geezer 360 Rep 1,193 Posts Drives: 08 E92 N53B30 Join Date: Jul 2007 Location: Budweis iTrader: (0) Garage List 2008 E92 N53B30 [10.00]	My solution to secondary cat removal – Supersprint: __________________
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03-04-2011, 10:40 AM	#20
guerilla twang I do my crosswords in pen. 17 Rep 751 Posts Drives: OEM+ 330i Join Date: Feb 2010 Location: KCMO iTrader: (6)	Why in God's name would you hack up the stock manifold when you could just get real headers? I realize that this is what OP is doing, but having some effin' jimmy rig is trash. It's a BMW, hack jobs are for Hondas. __________________ GRUPPE TITAN Midwest
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11-18-2013, 01:16 PM	#21
Pierre1014 New Member 0 Rep 16 Posts Drives: 2006 325i Join Date: Jun 2013 Location: Ny iTrader: (0)	I'm thinking about doing a primary cat delete on my 325i e90... After I cleared up the engine light I shouldn't have any problem passing an inspection right ?
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