Secondary Cat Delete

Ian SS · 04-14-2016, 04:48 PM

Seriously considering having a muffler shop cut out and weld in a straight pipe in place of the secondary cats. I've seen a thread regarding primary cat delete but couldnt find any concrete information regarding removing ONLY the secondary cats.

Has anyone done this? Not expecting any gains, mostly looking for sound.

Modshack · 04-14-2016, 04:52 PM

Check this thread:

http://www.camaro6.com/forums/showthread.php?t=448375

Glen e · 04-14-2016, 04:55 PM

Pm tr6 - he has done it on a 2ss....

Sledgehammer70 · 04-14-2016, 05:02 PM

Quote:

Originally Posted by slo_1ss

Seriously considering having a muffler shop cut out and weld in a straight pipe in place of the secondary cats. I've seen a thread regarding primary cat delete but couldnt find any concrete information regarding removing ONLY the secondary cats.

Has anyone done this? Not expecting any gains, mostly looking for sound.

The secondary cats are not hot swap able like the primary cats.You will have to have them cut out or do a full catback replacement.

SS 1LE · 04-14-2016, 05:36 PM

Quote:

Originally Posted by Sledgehammer70

The secondary cats are not hot swap able like the primary cats.You will have to have them cut out or do a full catback replacement.

He said that...

Ian SS · 04-14-2016, 06:17 PM

Quote:

Originally Posted by Modshack

Check this thread:

http://www.camaro6.com/forums/showthread.php?t=448375

Thanks

RonAndersonJr · 12-07-2016, 04:08 PM

Do we have to have a tune when removing the secondary cats?

RuthleSSchevy · 12-07-2016, 04:22 PM

Ive had no issues. Order some 2 3/4" pipe, it was hard to find locally

TJay74 · 12-07-2016, 05:28 PM

No tuning needed, the secondary cats are not monitored.

RonAndersonJr · 12-07-2016, 05:49 PM

Quote:

Originally Posted by TJay74

No tuning needed, the secondary cats are not monitored.

Yet there are people here who've said they are throwing codes

Baker · 12-07-2016, 05:59 PM

Quote:

Originally Posted by RonAndersonJr

Yet there are people here who've said they are throwing codes

Should only be throwing a code if there is a leak. I.e. Bad welds or bad fitment

Burly · 12-07-2016, 06:03 PM

There are some that claim a loss of torque too... I have not done it but want to.

mosaic16 · 12-07-2016, 09:16 PM

I just got mine deleted this afternoon. Granted I have not had long to drive and it's winter so I couldn't go WOT just give it 3/4 throttle for a ramp up to highway speed. No CEL on mine. Slightly louder and a little more gurgle on downshifts or if at a high RPM and just let off the gas and let the RPMs fall while holding a gear. During regular auto mode I don't hear that much of a difference around town. If I had to pick a unscientific arbitrary sound gain I would say 10 percent louder. I would imagine the M6 guys would get more enjoyment due to they can drive the way I was mentioning easier. There is zero change in volume with the NPP valves doing their job at cruise. Overall I'm happy with it. My local muffler shop charged me 60 dollars and the car was done in 30 min or so. At the end of the day it sure beats the prices for a pre made pipe plus the added cost for AFM valves in my case. Also there's no perceived loss of torque but no increase in felt power. I did not expect any loss or gain. I honestly think those negitive claims are in their head. You will have a bigger power difference based on weather and operating conditions than this mod. All of these are my opinions not facts.

MAGAUSA · 02-20-2017, 07:49 PM

Quote:

Originally Posted by CreativeDawn

I had mine done already for months and the true test for me was having the vehicle in Stealth Mode since I get a lot of rattling in Stealth when the valves are closed. The rattle had gained in noise by at least 15% only when accelerating! I feel the second cat-delete made the car overall slightly louder when I simply cruise or coast but when I opened her up after the break in period it sounded like a beast!

My passenger side valve rattles at times too.

04-14-2016, 04:48 PM	#1
Ian SS Drives: 2016 1SS, 2017 JKU Wrangler Join Date: Mar 2016 Location: San Diego Posts: 876 View My Garage	Secondary Cat Delete Seriously considering having a muffler shop cut out and weld in a straight pipe in place of the secondary cats. I've seen a thread regarding primary cat delete but couldnt find any concrete information regarding removing ONLY the secondary cats. Has anyone done this? Not expecting any gains, mostly looking for sound. __________________ SLO 1SS - sold 1SS MRC NPP 6MT 2018 Ram Rebel 4x4 5.7

04-14-2016, 04:52 PM	#2
Modshack Drives: 2SS, Hyper Blue Join Date: Feb 2016 Location: Greenville NC Posts: 835	Check this thread: http://www.camaro6.com/forums/showthread.php?t=448375 __________________ Steve Hyper Blue 2SS, 6M, NPP, Sunroof, Nav

04-14-2016, 04:55 PM	#3
Glen e Retired from Car mfrs.... Drives: 2LT RS/HR-V Join Date: May 2013 Location: /Fort Lauderdale Posts: 10,048	Pm tr6 - he has done it on a 2ss.... __________________ Glen CLICK HERE for detailing a new car: detailing for non detailers CLICK HERE for how to rinseless CLICK HERE for EASY wheel sealant

12-07-2016, 04:22 PM	#8
RuthleSSchevy Drives: 2016Camaro+1968Chevelle+1954BelAir Join Date: Feb 2013 Location: NH Posts: 149	Ive had no issues. Order some 2 3/4" pipe, it was hard to find locally __________________ "Lead me, follow me, or get out of my way." GGSP

12-07-2016, 04:08 PM	#7
RonAndersonJr Drives: 2016 Camaro 2SS Black on Black Join Date: Aug 2016 Location: Florida, Jacksonville/Lake City Posts: 58	Do we have to have a tune when removing the secondary cats?

12-07-2016, 05:28 PM	#9
TJay74 Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016 Location: Norman, OK Posts: 2,424	No tuning needed, the secondary cats are not monitored.

12-07-2016, 06:03 PM	#12
Burly Drives: 2016 Camaro 2SS Join Date: Apr 2016 Location: Spotsylvania, VA Posts: 724 View My Garage	There are some that claim a loss of torque too... I have not done it but want to.

12-07-2016, 09:16 PM	#13
mosaic16 Drives: 2016 mosaic black 2ss ash int A8 Join Date: Oct 2016 Location: Ft Riley, KS Posts: 31	I just got mine deleted this afternoon. Granted I have not had long to drive and it's winter so I couldn't go WOT just give it 3/4 throttle for a ramp up to highway speed. No CEL on mine. Slightly louder and a little more gurgle on downshifts or if at a high RPM and just let off the gas and let the RPMs fall while holding a gear. During regular auto mode I don't hear that much of a difference around town. If I had to pick a unscientific arbitrary sound gain I would say 10 percent louder. I would imagine the M6 guys would get more enjoyment due to they can drive the way I was mentioning easier. There is zero change in volume with the NPP valves doing their job at cruise. Overall I'm happy with it. My local muffler shop charged me 60 dollars and the car was done in 30 min or so. At the end of the day it sure beats the prices for a pre made pipe plus the added cost for AFM valves in my case. Also there's no perceived loss of torque but no increase in felt power. I did not expect any loss or gain. I honestly think those negitive claims are in their head. You will have a bigger power difference based on weather and operating conditions than this mod. All of these are my opinions not facts.

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