will a secondary cat delete affect smog & aatune

jlE90 · 10-31-2011, 03:00 PM

basically like title said, if i deleted my secondary cat will it affect me passing smog or affect my AA tune. i have a 06 325i, thanks in advance

DJ Apex · 10-31-2011, 03:14 PM

I have the aa tune and i deleted my 2ndary cats after the tune and wow i felt a big diff on top end from 4.5k to 6.5k if anything i think it helped. and the effect on smog im sure it dose but its not as noticable as if u were to delete the main cats. im going to my buddys kwik kar lube center they do inspections hes gonan run my car like if it was a 95 pre to measure the 5th and 6th gasses. so ill let u know

jlE90 · 10-31-2011, 03:17 PM

ty very much on the feedback, i might just wait for your results before i start hacking at my exhaust.

spacemonkey1112 · 11-11-2011, 11:17 AM

update?

Route 16 · 11-11-2011, 11:47 AM

Eisenmann said emissions test should pass with their set up and I only have my primary cats on. Won't be doing smog yet until next september though.

http://www.e90post.com/forums/showthread.php?t=608932

Gavin@MMW · 11-11-2011, 12:15 PM

2nd cats do not hurt smog. Or tunes, get rid of them!

spacemonkey1112 · 11-13-2011, 10:41 AM

Quote:

Originally Posted by Gavin@MMW

2nd cats do not hurt smog. Or tunes, get rid of them!

does your shop get rid of them? if so, how much do you charge?

moczak · 11-14-2011, 02:37 PM

^bump anyone?

iczz · 02-05-2012, 06:59 PM

Quote:

Originally Posted by Gavin@MMW

2nd cats do not hurt smog. Or tunes, get rid of them!

It just passed smog with AA tune and 2nd cats deleted.

Wlew · 02-06-2012, 12:28 AM

no problems here. However, thats NC emissions. I am running no 2nd cats, no res, and AA tune. Absolutely love it.

Do it.

10-31-2011, 03:00 PM	#1
jlE90 Private 17 Rep 64 Posts Drives: 06 Jet Black E90 Join Date: Sep 2010 Location: Bay Area iTrader: (0)	will a secondary cat delete affect smog & aatune basically like title said, if i deleted my secondary cat will it affect me passing smog or affect my AA tune. i have a 06 325i, thanks in advance
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10-31-2011, 03:14 PM	#2
DJ Apex Lieutenant 25 Rep 473 Posts Drives: 2006 330i Join Date: Nov 2010 Location: Houston TX iTrader: (1)	I have the aa tune and i deleted my 2ndary cats after the tune and wow i felt a big diff on top end from 4.5k to 6.5k if anything i think it helped. and the effect on smog im sure it dose but its not as noticable as if u were to delete the main cats. im going to my buddys kwik kar lube center they do inspections hes gonan run my car like if it was a 95 pre to measure the 5th and 6th gasses. so ill let u know
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10-31-2011, 03:17 PM	#3
jlE90 Private 17 Rep 64 Posts Drives: 06 Jet Black E90 Join Date: Sep 2010 Location: Bay Area iTrader: (0)	ty very much on the feedback, i might just wait for your results before i start hacking at my exhaust.
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11-11-2011, 11:17 AM	#4
spacemonkey1112 Captain 64 Rep 954 Posts Drives: E90 325i AW Join Date: Jan 2007 Location: 818, CA iTrader: (0)	update? __________________ 2006 E90 325i \| Sports Package \| 6MT \| 3IM \| PE \| AA \|
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11-11-2011, 11:47 AM	#5
Route 16 I got lei'd 844 Rep 7,593 Posts Drives: '10 E90 M3 Join Date: Sep 2011 Location: Dark Side of the Moon iTrader: (62)	Eisenmann said emissions test should pass with their set up and I only have my primary cats on. Won't be doing smog yet until next september though. http://www.e90post.com/forums/showthread.php?t=608932
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11-11-2011, 12:15 PM	#6
Gavin@MMW Brigadier General 406 Rep 3,879 Posts Drives: MMW Supercharged E90 328i Join Date: Nov 2009 Location: 818/805 iTrader: (18)	2nd cats do not hurt smog. Or tunes, get rid of them!
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11-14-2011, 02:37 PM	#8
moczak Private 5 Rep 78 Posts Drives: 2007 BMW 328xi coupe Join Date: Dec 2010 Location: Toronto, Canada iTrader: (0)	^bump anyone?
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02-06-2012, 12:28 AM	#10
Wlew Major 77 Rep 1,116 Posts Drives: 2011 E90 335i Join Date: Sep 2009 Location: Washington, DC iTrader: (12)	no problems here. However, thats NC emissions. I am running no 2nd cats, no res, and AA tune. Absolutely love it. Do it. __________________ 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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