Secondary cat delete?

914kid · 06-22-2013, 11:58 PM

Hello everyone,

I recently got a 2010 335xi sedan and I am loving it. I am under warranty and CPO and all that good stuff so I want to do two simple mods on the car for the TIME BEING. I also come from a B8 A4 so this car is fast enough for me already.

I am looking to get a bit more "sound" from my exhaust, I was thinking of doing the secondary cat delete. I have heard the muffler delete in person and while I like it, its a bit loud for me. I have the golf tee mod done and its pretty loud at cold start, I was hoping with the cat delete I will get a bit more gurgle and pop.

The second thing I want to do is DCI from BMS. No tune yet but I am mainly doing for the sound.

I was wondering if these things will cause me any issue if I go in for service? And reinstalling the secondary cat delete in the future is that possible or once its off its off?

Sorry for the noob questions I am sure you guys get tired of seeing these but I am a noob.

triggz · 06-23-2013, 01:03 AM

If you want more sound do catless downpipes. You'll get more power over sec cat delete.

914kid · 06-23-2013, 03:25 AM

Catless DP will come later. Right now I want a "lowkey" solution.

enrita · 06-23-2013, 03:52 AM

Quote:

Originally Posted by 914kid

Catless DP will come later. Right now I want a "lowkey" solution.

than get only an axle back exhaust. keep secondary cats.

Blaster400 · 06-23-2013, 07:27 AM

Quote:

Originally Posted by enrita

than get only an axle back exhaust. keep secondary cats.

+1
If you are thinking of going with catless downpipes later on you'll definitely want to keep the secondary cats in. Removing them gets you minimal sound and power gains.

zeenon53 · 06-23-2013, 09:44 AM

I removed the secondary cats on my e90. It didn't do all that much but gave it a little more sound. It was perfect for what I was looking for. Eventually I got catless downpipes with the stock exhaust and the sound is perfect. The car sounds pretty much stock at cruising speeds but when stepped on it has a little more punch.

froop · 06-23-2013, 09:59 AM

Changing your mids can definitely alter the sound. Look at getting some wider mids such as the 2.5" berk, maddad, or CP-E. N55 mids will not make much difference but those 3 definitely will.

914kid · 06-23-2013, 09:56 PM

Catless downpipes are on the list but not for another 2 years. In the time being I want to delete secondary cat for a nice "throatier" exhaust. Don't care for performance gains atm.

triggz · 06-24-2013, 09:02 AM

You will not get a throatier sound. You'll get better throttle response but that's about it. Get the PE and you'll be very happy.

Wedge1967 · 06-24-2013, 09:11 AM

Don't make the mistake of removing the secondary cats. You'll get the sound you're looking for by just putting Down Pipes on your car. Doing secondary delete will also get you drone and possible a car that smokes really bad depending on how bad your turbos are worn. If you want more sound after, remove your resonators. I have an e92 and we don't have them like the e90.

bmwm3redblack · 06-29-2013, 01:55 PM

Quote:

Originally Posted by Wedge1967

Don't make the mistake of removing the secondary cats. You'll get the sound you're looking for by just putting Down Pipes on your car. Doing secondary delete will also get you drone and possible a car that smokes really bad depending on how bad your turbos are worn. If you want more sound after, remove your resonators. I have an e92 and we don't have them like the e90.

So our cars better sounding stock than e90????

bmwm3redblack · 06-29-2013, 01:56 PM

Quote:

Originally Posted by triggz

You will not get a throatier sound. You'll get better throttle response but that's about it. Get the PE and you'll be very happy.

Is the throttle response noticable?

Wedge1967 · 06-29-2013, 04:28 PM

Quote:

Originally Posted by bmwm3redblack

So our cars better sounding stock than e90????

Much better...

06-22-2013, 11:58 PM	#1
914kid Banned 25 Rep 363 Posts Drives: E90 335xi Join Date: Jun 2013 Location: Pelham, NY iTrader: (1)	Secondary cat delete? Hello everyone, I recently got a 2010 335xi sedan and I am loving it. I am under warranty and CPO and all that good stuff so I want to do two simple mods on the car for the TIME BEING. I also come from a B8 A4 so this car is fast enough for me already. I am looking to get a bit more "sound" from my exhaust, I was thinking of doing the secondary cat delete. I have heard the muffler delete in person and while I like it, its a bit loud for me. I have the golf tee mod done and its pretty loud at cold start, I was hoping with the cat delete I will get a bit more gurgle and pop. The second thing I want to do is DCI from BMS. No tune yet but I am mainly doing for the sound. I was wondering if these things will cause me any issue if I go in for service? And reinstalling the secondary cat delete in the future is that possible or once its off its off? Sorry for the noob questions I am sure you guys get tired of seeing these but I am a noob.
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06-23-2013, 01:03 AM	#2
triggz Banned 56 Rep 1,224 Posts Drives: E92 335i Join Date: Jun 2010 Location: Toronto iTrader: (2)	If you want more sound do catless downpipes. You'll get more power over sec cat delete.
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06-23-2013, 03:25 AM	#3
914kid Banned 25 Rep 363 Posts Drives: E90 335xi Join Date: Jun 2013 Location: Pelham, NY iTrader: (1)	Catless DP will come later. Right now I want a "lowkey" solution.
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06-23-2013, 09:44 AM	#6
zeenon53 Major 39 Rep 1,154 Posts Drives: BMW Join Date: Apr 2010 Location: obx iTrader: (3)	I removed the secondary cats on my e90. It didn't do all that much but gave it a little more sound. It was perfect for what I was looking for. Eventually I got catless downpipes with the stock exhaust and the sound is perfect. The car sounds pretty much stock at cruising speeds but when stepped on it has a little more punch. __________________ 2016 340i xdrive 2009 335i
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06-23-2013, 09:59 AM	#7
froop Colonel 171 Rep 2,682 Posts Drives: 08 AW 6MT E82 Join Date: Jul 2012 Location: Sydney, Australia iTrader: (3)	Changing your mids can definitely alter the sound. Look at getting some wider mids such as the 2.5" berk, maddad, or CP-E. N55 mids will not make much difference but those 3 definitely will. __________________ froop's AW 135i Build Thread
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06-23-2013, 09:56 PM	#8
914kid Banned 25 Rep 363 Posts Drives: E90 335xi Join Date: Jun 2013 Location: Pelham, NY iTrader: (1)	Catless downpipes are on the list but not for another 2 years. In the time being I want to delete secondary cat for a nice "throatier" exhaust. Don't care for performance gains atm.
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06-24-2013, 09:02 AM	#9
triggz Banned 56 Rep 1,224 Posts Drives: E92 335i Join Date: Jun 2010 Location: Toronto iTrader: (2)	You will not get a throatier sound. You'll get better throttle response but that's about it. Get the PE and you'll be very happy.
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06-24-2013, 09:11 AM	#10
Wedge1967 Banned 125 Rep 2,172 Posts Drives: '07 e92 AT Sport Montego Blue Join Date: Sep 2011 Location: Portland, OR iTrader: (3)	Don't make the mistake of removing the secondary cats. You'll get the sound you're looking for by just putting Down Pipes on your car. Doing secondary delete will also get you drone and possible a car that smokes really bad depending on how bad your turbos are worn. If you want more sound after, remove your resonators. I have an e92 and we don't have them like the e90.
	Appreciate 0 Quote