exhaust sound with catted DPs

Hellrot Sachin · 07-03-2013, 08:49 AM

Hey all.. I am thinking of going with a set of catted DPs.. Can anyone tell me how this will change the exhaust sound, depth, or loudness.. I am happy with my factory exhaust sound and don't really want anything louder during regular cruising.. louder at WOT would be fine.. thanks!

roadkillrob · 07-03-2013, 09:50 AM

I didn't notice much of a difference with my AR catted DP's, maybe a little more turbo spool sound but that is it.

That being said, I would highly recommend not wasting your money as the newer versions of the software on the car have tightened the ranges for the 02 sensors to operate in, so most catted downpipes don't actually work. AR claims you need the these $2000 cat's to make them work on newer software.

Mine worked for about a year, then got a software update and they throw CEL's and had to do a DP fix from BMS, so wish I just went catless and saved a bunch of money.

From AR's website (29.2 is like the original 2008 and older software)

NO CEL on pre 29.2 cars. Post 29.2 cars may require a DP Fix.

Rob

E90Company · 07-03-2013, 10:18 AM

@BuraQ is running catted DP's with Dinan mufflers. His exhaust sounds great, let him chime in.

ZROFCKSGVN · 07-03-2013, 10:22 AM

catless dps didnt make much of a difference as far as sound so i doubt catted ones will

Rookie83 · 07-03-2013, 01:26 PM

i noticed a huge difference especially on cold start with 3in catless

carlsontheflyer · 07-03-2013, 01:43 PM

@BuraQ has a RennTech tuned 2011 335is with cP-e downpipes with high flow cats, and it's emissions legal in all 50 states without any "funny stuff". I am sure he has the latest firmware on his car.

Bee Pee · 07-03-2013, 02:40 PM

+1 re nothing more than slightly more turbo spooling with AR catted DP as they single skin whilst oem are double skin

BQTuning · 07-03-2013, 03:32 PM

Quote:

Originally Posted by E90Company

@BuraQ is running catted DP's with Dinan mufflers. His exhaust sounds great, let him chime in.

Quote:

Originally Posted by carlsontheflyer

@BuraQ has a RennTech tuned 2011 335is with cP-e downpipes with high flow cats, and it's emissions legal in all 50 states without any "funny stuff". I am sure he has the latest firmware on his car.

+1 +1

Car has the latest update for the DME and the DCT. Never had a CEL due to the high flow catted DPs and its been 1.5 years having the tune and beaten the hell out of the car race after race

I did however have DP fitment issues and exhaust leaks and had to have them "tailored" to the specifics...issue fixed

Here is an exhaust note vid:

07-03-2013, 08:49 AM	#1
Hellrot Sachin First Lieutenant 42 Rep 344 Posts Drives: TiAg E90 335i Join Date: Dec 2010 Location: Dallas iTrader: (3)	exhaust sound with catted DPs Hey all.. I am thinking of going with a set of catted DPs.. Can anyone tell me how this will change the exhaust sound, depth, or loudness.. I am happy with my factory exhaust sound and don't really want anything louder during regular cruising.. louder at WOT would be fine.. thanks!
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07-03-2013, 09:50 AM	#2
roadkillrob Major General 881 Rep 5,463 Posts Drives: 08 335i,22 X3M, 2012 C63 Black Join Date: Jul 2007 Location: Boston iTrader: (15)	I didn't notice much of a difference with my AR catted DP's, maybe a little more turbo spool sound but that is it. That being said, I would highly recommend not wasting your money as the newer versions of the software on the car have tightened the ranges for the 02 sensors to operate in, so most catted downpipes don't actually work. AR claims you need the these $2000 cat's to make them work on newer software. Mine worked for about a year, then got a software update and they throw CEL's and had to do a DP fix from BMS, so wish I just went catless and saved a bunch of money. From AR's website (29.2 is like the original 2008 and older software) NO CEL on pre 29.2 cars. Post 29.2 cars may require a DP Fix. Rob __________________ 2025 X5 Msport 2008 E93 335i FBO 2012 Mercedes C63 Black Series Alanite Grey
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07-03-2013, 10:18 AM	#3
E90Company Major General 196 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	@BuraQ is running catted DP's with Dinan mufflers. His exhaust sounds great, let him chime in.
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07-03-2013, 10:22 AM	#4
ZROFCKSGVN Hi Hater 15 Rep 424 Posts Drives: Reckless Join Date: Jun 2013 Location: All Over iTrader: (0)	catless dps didnt make much of a difference as far as sound so i doubt catted ones will
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07-03-2013, 01:26 PM	#5
Rookie83 First Lieutenant 15 Rep 380 Posts Drives: 2009 335i 6mt cpe Join Date: May 2011 Location: DFW iTrader: (1)	i noticed a huge difference especially on cold start with 3in catless __________________ 09 tasman 335 6mt cpe, jb4 g5, bms dci, bms 3" catless dp's, 7"vrsf fmic, e85+93
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07-03-2013, 01:43 PM	#6
carlsontheflyer Private First Class 66 Rep 170 Posts Drives: 2019 M2C, AW, 6MT of course! Join Date: May 2013 Location: Atlanta, GA, USA iTrader: (1)	@BuraQ has a RennTech tuned 2011 335is with cP-e downpipes with high flow cats, and it's emissions legal in all 50 states without any "funny stuff". I am sure he has the latest firmware on his car. __________________ Carlson The Flyer 2022 X3M Competition, Brooklyn Gray, fully loaded
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07-03-2013, 02:40 PM	#7
Bee Pee Brigadier General 1788 Rep 4,529 Posts Drives: AW M2 DCT Join Date: Jun 2010 Location: SW London iTrader: (3)	+1 re nothing more than slightly more turbo spooling with AR catted DP as they single skin whilst oem are double skin
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