Pros and Cons of a secondary cat delete?

e92coupeblack · 11-01-2015, 04:39 PM

I own a still-under-warranty cpo e92 328i and am taking the car in to get a resonator delete. I already have a custom muffler on the back that makes the car pretty loud, but I want more. I have been considering a secondary cat delete at the same time I get the resonator delete, but need to know what the pros and cons are from a warranty and legality point of view. I live in california, but am told that I will still pass the smog test if I do decide to get a secondary cat delete.

Thanks

Taskmaster · 11-01-2015, 04:43 PM

Quote:

Originally Posted by e92coupeblack

I own a still-under-warranty cpo e92 328i and am taking the car in to get a resonator delete. I already have a custom muffler on the back that makes the car pretty loud, but I want more. I have been considering a secondary cat delete at the same time I get the resonator delete, but need to know what the pros and cons are from a warranty and legality point of view. I live in california, but am told that I will still pass the smog test if I do decide to get a secondary cat delete.

Thanks

Probably not. It's illegal to alter or change the emission control systems on the car.

Suggestion: Muffler delete.

e92coupeblack · 11-01-2015, 04:52 PM

My friend has a muffler delete on his and I like the way it sounds, but the loudness between mine and his are almost indistinguishable. I want it to be really loud, without getting hit with a huge fine.

tc535i · 11-01-2015, 04:52 PM

Quote:

Originally Posted by TheAxiom

Probably not. It's illegal to alter or change the emission control systems on the car.

Suggestion: Muffler delete.

Yes, but i think o2 sensors are before and after the primary cats, so secondary won't show on the obd2 readiness?

justpete · 11-01-2015, 04:52 PM

California does a visual inspection so you'd fail emissions if you do a secondary delete.

tc535i · 11-01-2015, 05:05 PM

Quote:

Originally Posted by justpete

California does a visual inspection so you'd fail emissions if you do a secondary delete.

Yeah, they drop the belly pan, crawl under the car, and check.

justpete · 11-01-2015, 05:12 PM

Quote:

Originally Posted by tc535i

Yeah, they drop the belly pan, crawl under the car, and check.

And fer some gotdam reason it's a felony to mine the pan.

Tom Droze · 11-01-2015, 05:17 PM

If you buy the mid pipes, which would delete the secondary cats, you could swap them back and forth for emission inspection purposes.

justpete · 11-01-2015, 05:20 PM

Quote:

Originally Posted by Tom Droze

If you buy the mid pipes, which would delete the secondary cats, you could swap them back and forth for emission inspection purposes.

Yeah and that'd save ya the trouble of trying to track down a reasonably priced claymore.

rich123321 · 11-01-2015, 05:47 PM

Deleted mine and no problems with my muffler delete

Eagle1oh7 · 11-01-2015, 06:40 PM

I live in Cali and I just held onto my cats after installing my Eisenmann catback. They just sit in the garage awaiting the day to be of use.

jc5988 · 11-02-2015, 10:27 AM

pro: increase around 3-5 hp for N51 and you can feel it

exhaust sound much better, more bubuling with PE,

No SES, will pass sniffer and non sniffer smog test.

Con: wont pass visual smog inspection,

Rival · 11-03-2015, 09:47 AM

7-8rwhp
3-4 rwtq

as long as you dont live in a state like CA your GTG, if you do, dont even think about it.

tc535i · 11-03-2015, 10:15 AM

Quote:

Originally Posted by Rival

7-8rwhp
3-4 rwtq

as long as you dont live in a state like CA your GTG, if you do, dont even think about it.

plenty of us in CA don't exactly "conform"

jfisher160 · 11-03-2015, 01:31 PM

I had a 328i fully modded with everything done to it under CPO.

The secondary cat delete will give you alittle more HP and a nice sound. I would recommend it, I never had a problem taking the car into service. But my dealership was mod friendly.

JDane07 · 11-03-2015, 04:41 PM

Quote:

Originally Posted by Rival

as long as you dont live in a state like CA your GTG, if you do, dont even think about it.

Whoops.

gunnerxq · 11-03-2015, 05:48 PM

Quote:

Originally Posted by jc5988

pro: increase around 3-5 hp for N51 and you can feel it

exhaust sound much better, more bubuling with PE,

No SES, will pass sniffer and non sniffer smog test.

Con: wont pass visual smog inspection,

Wait fail visual smog inspection? So like white smoke or something?

jc5988 · 11-03-2015, 05:50 PM

Quote:

Originally Posted by gunnerxq

Wait fail visual smog inspection? So like white smoke or something?

fail for cat not being there

tc535i · 11-03-2015, 06:28 PM

Quote:

Originally Posted by gunnerxq

Wait fail visual smog inspection? So like white smoke or something?

no, he's saying if they get under the car, remove the pan, and check for cats they could fail you since they're gone.

I've never seen them look under the car. Never.

Eagle1oh7 · 11-03-2015, 07:24 PM

Quote:

Originally Posted by tc535i

Quote:

Originally Posted by Rival

7-8rwhp
3-4 rwtq

as long as you dont live in a state like CA your GTG, if you do, dont even think about it.

plenty of us in CA don't exactly "conform"

Chrispy650 · 11-03-2015, 07:56 PM

Say you got the afe racing midpipes to go along with a PE. Are they going to even notice the cats missing if there's no cuts in the piping? Do they even know to look for the secondary cats? I feel like most cars don't have secondaries (could be wrong though). I live in CA. On my previous e90 I deleted the secondaries but never had to get a smog check done (deleted them after I got it done). On my e92 I'm thinking of getting some mid pipes to replace the secondaries so they would be easy to bolt on again if I ever had to put them on.

Route 16 · 11-03-2015, 11:09 PM

Quote:

Originally Posted by Chrispy650

Say you got the afe racing midpipes to go along with a PE. Are they going to even notice the cats missing if there's no cuts in the piping? Do they even know to look for the secondary cats? I feel like most cars don't have secondaries (could be wrong though). I live in CA. On my previous e90 I deleted the secondaries but never had to get a smog check done (deleted them after I got it done). On my e92 I'm thinking of getting some mid pipes to replace the secondaries so they would be easy to bolt on again if I ever had to put them on.

i passed smog with my eisenmann mid pipes (no 2ndary cats)...but the shop was mod friendly anyway but you'll be alright, AS LONG AS THE PRIMARIES ARE THERE.

11-01-2015, 04:39 PM	#1
e92coupeblack New Member 8 Rep 25 Posts Drives: 328i e92 M Sport Join Date: Aug 2015 Location: Santa Barbara iTrader: (0)	Pros and Cons of a secondary cat delete? I own a still-under-warranty cpo e92 328i and am taking the car in to get a resonator delete. I already have a custom muffler on the back that makes the car pretty loud, but I want more. I have been considering a secondary cat delete at the same time I get the resonator delete, but need to know what the pros and cons are from a warranty and legality point of view. I live in california, but am told that I will still pass the smog test if I do decide to get a secondary cat delete. Thanks
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11-01-2015, 04:52 PM	#3
e92coupeblack New Member 8 Rep 25 Posts Drives: 328i e92 M Sport Join Date: Aug 2015 Location: Santa Barbara iTrader: (0)	My friend has a muffler delete on his and I like the way it sounds, but the loudness between mine and his are almost indistinguishable. I want it to be really loud, without getting hit with a huge fine.
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11-01-2015, 04:52 PM	#5
justpete Brigadier General 1232 Rep 3,778 Posts Drives: '11 328i '19 M6 Join Date: Jan 2012 Location: DFW iTrader: (0) Garage List 2019 BMW M6 [10.00] 2011 BMW 328i [9.00]	California does a visual inspection so you'd fail emissions if you do a secondary delete. __________________ 2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
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11-01-2015, 05:17 PM	#8
Tom Droze Major 413 Rep 1,286 Posts Drives: 2012 BMW 328i (e92) Join Date: Jul 2014 Location: Scottsdale, Arizona iTrader: (0)	If you buy the mid pipes, which would delete the secondary cats, you could swap them back and forth for emission inspection purposes. __________________ 2012 Jet Black 328i Coupe / ESS Tuning Gen. 2 Supercharger / Evolution Racewerks Oil Cooler / BMS Oil Catch Can / BMW Performance Exhaust with Dinan Y Pipe / Eibach Pro Kit Springs / Koni FSD Shocks / MFactory LSD & Differential Bushings / Performance Rear Trailing Arms / BMW Performance Strut Brace / Stop Tech Slotted Rotors / Hawk HPS 5.0 / SS Brake Lines / Brass Guide Pins / M3 Front Control Arms, 28 MM FSB, Engine Cowl, and DCT Paddle Shifters / Michelin PSS / APEX ARC-8
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11-01-2015, 05:47 PM	#10
rich123321 Captain 72 Rep 838 Posts Drives: BMW 325i E90 Join Date: Jan 2012 Location: South Florida iTrader: (1) Garage List 2015 335i [0.00]	Deleted mine and no problems with my muffler delete
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11-01-2015, 06:40 PM	#11
Eagle1oh7 Lieutenant Colonel 287 Rep 1,710 Posts Drives: '11 328i Sedan Join Date: Oct 2012 Location: Chula Vista CA iTrader: (0)	I live in Cali and I just held onto my cats after installing my Eisenmann catback. They just sit in the garage awaiting the day to be of use. __________________ DONE: Seibon CF Hood, M3 Rep, MSport rear w/DD CF Diffuser, M3 Rep Skirts, Seibon CSL trunklid, Forgestar F14 18s w/Michelin PSS, Eisenmann catback, AA Headers, BPC Stage 2, Charcoal Delete+revMotor+AFE Drop In filter FUTURE MODS: LED headlights, CF rooftop, M3 Suspension Conversion, Dinan CAI Mod
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11-02-2015, 10:27 AM	#12
jc5988 Captain 91 Rep 611 Posts Drives: 2010 328i 6MT Join Date: Aug 2011 Location: Los Angeles iTrader: (0)	pro: increase around 3-5 hp for N51 and you can feel it exhaust sound much better, more bubuling with PE, No SES, will pass sniffer and non sniffer smog test. Con: wont pass visual smog inspection, __________________ N51- PI - PE - ESS Tuned - SSK - CDV Delete - AFE Header - B12 - Mfactory LSD
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11-03-2015, 09:47 AM	#13
Rival Captain 66 Rep 790 Posts Drives: 95 z28 Join Date: Jul 2012 Location: shytown iTrader: (0)	7-8rwhp 3-4 rwtq as long as you dont live in a state like CA your GTG, if you do, dont even think about it. __________________ 2010 335i M sport 2008 328i 2006 325i 1995 Z28 6spd - 377rwhp rip
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11-03-2015, 01:31 PM	#15
jfisher160 First Lieutenant 19 Rep 331 Posts Drives: 2012 335is Coupe Join Date: Jun 2010 Location: Thousand Oaks, CA iTrader: (3)	I had a 328i fully modded with everything done to it under CPO. The secondary cat delete will give you alittle more HP and a nice sound. I would recommend it, I never had a problem taking the car into service. But my dealership was mod friendly. __________________ New - 2013 - 320i - 15% Tint - Future Mods ( BMS Tune, Suspension, Wheels, Exhaust) Sold - 2007 328i (3-Stage Manifold - BMW Perf Intake w/Scoops - Powerbox - Magnaflow Exhaust - MMW Headers - KW Street Comfort - VMR 701s 19' w/M3 offset - BMW Strut Brace - 330I Brake Conversation - 5% Tint All Around - 8K HID Fog Lights -Angel Eyes)
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11-03-2015, 07:56 PM	#21
Chrispy650 Lieutenant 56 Rep 559 Posts Drives: E92 LCI Join Date: Nov 2011 Location: SoCal (Irvine) iTrader: (2)	Say you got the afe racing midpipes to go along with a PE. Are they going to even notice the cats missing if there's no cuts in the piping? Do they even know to look for the secondary cats? I feel like most cars don't have secondaries (could be wrong though). I live in CA. On my previous e90 I deleted the secondaries but never had to get a smog check done (deleted them after I got it done). On my e92 I'm thinking of getting some mid pipes to replace the secondaries so they would be easy to bolt on again if I ever had to put them on.
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