Removing cat and res??? - BMW 3-Series (E90 E92) Forum

SuckMy_Nick · 01-29-2013, 02:23 PM

So I went to a custom exhaust shop in MA, I asked for better sound and flow, he suggested to delete my second cat and my res... Is this the best options? I've seen alot of people do different combinations of deletes and have heard alot of opinions.. Any one with helpful opinions and not just bias

mike-y · 01-29-2013, 05:01 PM

if you do that, it will be LOUD, so make sure that's what you want.

kamek · 01-29-2013, 05:33 PM

Quote:

Originally Posted by mike-y

if you do that, it will be LOUD, so make sure that's what you want.

No, it won't be that loud, especially into a stock exhaust.

apptwins · 02-01-2013, 06:49 PM

Highly recommend performing a secondary-cat-ectomy. We cut those out at my local shop and tossed them in the dust bin. Worthless little pieces of crap!

Now whatever other exhaust mods you do will be a true enhancement.

Cheers mate

RaddM3 · 02-01-2013, 07:22 PM

I have the perfect recommendation for you. Check it out!

apptwins · 02-01-2013, 09:52 PM

Like !!
Whooo Whoooo !!!

SuckMy_Nick · 02-01-2013, 10:43 PM

Quote:

Originally Posted by RaddN54

I have the perfect recommendation for you. Check it out!

Still got my whistle installed, I wanna make it louder

SDemetris · 02-02-2013, 01:21 AM

Not that loud. I have PE which is res-less and cat delete and i would say its a good volume

Amini77 · 02-02-2013, 03:20 AM

Quote:

Originally Posted by SDemetris

Not that loud. I have PE which is res-less and cat delete and i would say its a good volume

Secondary cat delete or primary? Don't the primary cats on the headers, if taken out, release more power than taking out the secondary cats?

SDemetris · 02-02-2013, 03:07 PM

Quote:

Originally Posted by Amini77

Secondary cat delete or primary? Don't the primary cats on the headers, if taken out, release more power than taking out the secondary cats?

Secondaries.

Amini77 · 02-02-2013, 03:21 PM

Quote:

Originally Posted by SDemetris

Secondaries.

That only answered 1/3 of my questions lmao

SDemetris · 02-02-2013, 05:20 PM

Quote:

Originally Posted by Amini77

That only answered 1/3 of my questions lmao

Sorry i was on my phone.. i only got my secondaries off because it was cheaper and i didnt have to buy any O2 sims.. but your understanding is correct

DUI Elite · 02-02-2013, 05:33 PM

still debating if this is worth it.

I've been tossing around the idea for months. I've noticed my exhaust is getting louder (as the exhaust ages). My parents even ask, when I rarely have them in the car, if I did something to it as they don't remember it being as loud when I had it new.

I kinda want to trust them in thinking its gotten louder because they've only been in it a few times over a pretty good amount of time since I've had it and they're picking up on a difference.

01-29-2013, 02:23 PM	#1
SuckMy_Nick Red Liner Drives: e92 328xi Join Date: Dec 2012 Location: Boston Posts: 112 iTrader: (0)	Removing cat and res??? So I went to a custom exhaust shop in MA, I asked for better sound and flow, he suggested to delete my second cat and my res... Is this the best options? I've seen alot of people do different combinations of deletes and have heard alot of opinions.. Any one with helpful opinions and not just bias __________________ 07' E92 328xi - Black Kidney\|Black Emblems\|Injen SP Intake\|MMW Headers\|AA Stage 2 Tune\|-
	Tweet

02-01-2013, 06:49 PM	#4
apptwins New Member Drives: e90 2006 325xi 6MT Join Date: Jan 2012 Location: Golden, Colorado Posts: 15 iTrader: (0)	Highly recommend performing a secondary-cat-ectomy. We cut those out at my local shop and tossed them in the dust bin. Worthless little pieces of crap! Now whatever other exhaust mods you do will be a true enhancement. Cheers mate __________________ Cheers-Bill 2006 E90 (early build 11/05) 325xi 6MT Alpine White, DeBadged, Rogue-ICON, stainless brakelines, Power Slot rotors, CDV delete, post-CAT delete, aFe intake+MAF TimShim, LED interior lighting, Escort Passport 8500 x50

02-01-2013, 09:52 PM	#6
apptwins New Member Drives: e90 2006 325xi 6MT Join Date: Jan 2012 Location: Golden, Colorado Posts: 15 iTrader: (0)	Like !! Whooo Whoooo !!! __________________ Cheers-Bill 2006 E90 (early build 11/05) 325xi 6MT Alpine White, DeBadged, Rogue-ICON, stainless brakelines, Power Slot rotors, CDV delete, post-CAT delete, aFe intake+MAF TimShim, LED interior lighting, Escort Passport 8500 x50

02-02-2013, 01:21 AM	#8
SDemetris Private First Class Drives: E90 328xi Join Date: Jul 2012 Location: Pittsburgh, PA Posts: 131 iTrader: (0)	Not that loud. I have PE which is res-less and cat delete and i would say its a good volume __________________ 2007 328xi - Sport Package- Cold Weather Package - 6MT - BMW PE - Secondary Cats Removed - 3 Stage Intake Manifold - Charcoal Filter Delete - Intake Muffler Delete - AFe dry drop in filter - Cyba Scoops - CDV Delete - H&R Sport Springs - Bilstein Sport Shocks - Black Kidneys - CF Mirror Caps - Custom Gunmetal Powder Coated M-Parallels

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

01-29-2013, 05:01 PM	#2
mike-y just another bmw douche bag Drives: 1.9L of fury Join Date: Nov 2008 Location: Los Angeles, CA Posts: 2,789 iTrader: (4)	if you do that, it will be LOUD, so make sure that's what you want.

02-01-2013, 07:22 PM	#5
RaddM3 Private First Class Drives: E92 M3 Space Grey Join Date: Mar 2012 Location: San Diego Posts: 190 iTrader: (2)	I have the perfect recommendation for you. Check it out!

02-02-2013, 05:33 PM	#13
DUI Elite ///M at Heart Drives: 2006 SGM E90 Join Date: Jan 2011 Location: Chicago, IL Posts: 1,296 iTrader: (2)	still debating if this is worth it. I've been tossing around the idea for months. I've noticed my exhaust is getting louder (as the exhaust ages). My parents even ask, when I rarely have them in the car, if I did something to it as they don't remember it being as loud when I had it new. I kinda want to trust them in thinking its gotten louder because they've only been in it a few times over a pretty good amount of time since I've had it and they're picking up on a difference.