Deleting cats and res help? 325i

Hahnsolo27 · 11-09-2015, 12:50 PM

I recently deleted my muffler on my 06 325i and it sounds nice but I'm looking for a little bit more sound and rumble so I'm thinking about deleting the secondary cats and the resonator? will i throw and codes if i do this? i don't remember if i saw a 02 censor by the second cats.

fravel · 11-09-2015, 12:59 PM

Nope, your secondary 02 sensor is upstream of the secondary cats so the car won't know any different. I'm running essentially the same setup (AFE secondary pipes + BME PE).

Hahnsolo27 · 11-09-2015, 01:10 PM

nice! how does she sound with your set up

fravel · 11-09-2015, 03:56 PM

Personally I think it's fantastic. It's aggressive without being obnoxious.

Hahnsolo27 · 11-09-2015, 04:02 PM

Sick! i was worried it mite be to loud. I'm pulling the trigger then. I'm doing it!

Eddien123 · 11-09-2015, 09:18 PM

Quote:

Originally Posted by Hahnsolo27

Sick! i was worried it mite be to loud. I'm pulling the trigger then. I'm doing it!

Yeah secondary cats throw no codes and will still pass emissions. But I'd suggest keeping the resonator. It adds more rasp than it does sound. You want it to be loud but a good loud. I've heard secondary cat and muffler deletes with the resonator still on and it sounded fantastic

54VAGE · 11-10-2015, 09:16 AM

straight pipe everything, yolo lol. deleting secondary cats will also create gains. and then a downpipe of course.

11-09-2015, 12:50 PM	#1
Hahnsolo27 New Member 0 Rep 20 Posts Drives: 2007 335i Join Date: Jul 2015 Location: San diego iTrader: (0)	Deleting cats and res help? 325i I recently deleted my muffler on my 06 325i and it sounds nice but I'm looking for a little bit more sound and rumble so I'm thinking about deleting the secondary cats and the resonator? will i throw and codes if i do this? i don't remember if i saw a 02 censor by the second cats.
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11-09-2015, 12:59 PM	#2
fravel Colonel 1645 Rep 2,494 Posts Drives: Monaco Blue '06 330i Join Date: Aug 2012 Location: The Nasti 'Nati iTrader: (1)	Nope, your secondary 02 sensor is upstream of the secondary cats so the car won't know any different. I'm running essentially the same setup (AFE secondary pipes + BME PE). __________________
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11-09-2015, 01:10 PM	#3
Hahnsolo27 New Member 0 Rep 20 Posts Drives: 2007 335i Join Date: Jul 2015 Location: San diego iTrader: (0)	nice! how does she sound with your set up
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11-09-2015, 03:56 PM	#4
fravel Colonel 1645 Rep 2,494 Posts Drives: Monaco Blue '06 330i Join Date: Aug 2012 Location: The Nasti 'Nati iTrader: (1)	Personally I think it's fantastic. It's aggressive without being obnoxious. __________________
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11-09-2015, 04:02 PM	#5
Hahnsolo27 New Member 0 Rep 20 Posts Drives: 2007 335i Join Date: Jul 2015 Location: San diego iTrader: (0)	Sick! i was worried it mite be to loud. I'm pulling the trigger then. I'm doing it!
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11-10-2015, 09:16 AM	#7
54VAGE Second Lieutenant 15 Rep 200 Posts Drives: '09 E92 N54 335i Join Date: Jun 2015 Location: East Meadow iTrader: (0) Garage List 2009 BMW 335i [0.00]	straight pipe everything, yolo lol. deleting secondary cats will also create gains. and then a downpipe of course. __________________ E92 N54 JB4, MHD, Alpina flash, ARM DPs, Cobb CP/HKS bov, BMS DCI/OCV, PE exhaust, 2nd cat delete (vibrant 1792), Mishimoto FMIC, Fuel-It stage 2, Msport F30 N20 EWG
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