Secondary Cat Delete - Page 2

Antista1974 · 03-20-2017, 09:33 PM

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laynlo15 · 03-20-2017, 09:54 PM

Hum, been around for a while, still can't figure out why you want to delete one of the cats? Make it louder, for a couple hp, check engine light? So explain.

sav03cobra · 03-20-2017, 11:03 PM

Quote:

Originally Posted by laynlo15

Hum, been around for a while, still can't figure out why you want to delete one of the cats? Make it louder, for a couple hp, check engine light? So explain.

I've ran about 6 months now. No issues, no CEL. Do I think it gained any HP?...no probably not but I didn't dyno it either. However, does it sound like freedom and bald eagle noises?...Hell yeah it does. It's a mod and people do it; sounds more aggressive to me and I love it.

bryguycbr · 03-21-2017, 08:11 AM

Installed Stainless Works catback with AFM valves, secondary cats removed, CEL P0420, replaced cat on driver side, all is good now, all parts covered under factory warranty. Exhaust sounds awesome, I have 11,000 miles and every thing works great.

KyBoy · 03-21-2017, 08:57 AM

I have Borla S-Type 11924 & 60606. Replaced all this heavy junk. Car sounds awesome and feels like it can just breathe now. No CEL.

cmeJATT · 03-21-2017, 11:00 AM

i replaced mine by cutting it out and welding in straight pipe from muffler shop

Antista1974 · 03-21-2017, 09:25 PM

Well my car dropped about 8 lbs and sounds much better when I open the throttle up it screams........as far as power....doubt I gained any. Cold intake in the mail so maybe this week I can feel a power difference...maybe.

bryguycbr · 03-21-2017, 10:41 PM

Quote:

Originally Posted by Antista1974

Well my car dropped about 8 lbs and sounds much better when I open the throttle up it screams........as far as power....doubt I gained any. Cold intake in the mail so maybe this week I can feel a power difference...maybe.

Stainless Works catback, secondary cats removed, RotoFab CAI, ran dyno last month, 411 RWHP, 427 torque. Stock motor, no tune.

bryguycbr · 03-21-2017, 10:47 PM

Quote:

Originally Posted by laynlo15

Hum, been around for a while, still can't figure out why you want to delete one of the cats? Make it louder, for a couple hp, check engine light? So explain.

Stainless Works catback connects to primary cats, it's designed to run without the secondary cat.

TJay74 · 03-22-2017, 08:11 AM

Quote:

Originally Posted by laynlo15

Hum, been around for a while, still can't figure out why you want to delete one of the cats? Make it louder, for a couple hp, check engine light? So explain.

There are 2 sets of cats on the cars now, have been this way since 2009 when GM went to 1 Global USA vehicle instead of the 49 state cars which only has primary cats and the California cars that had primary cats and secondary cats.

The secondary cats are not monitored by the computer system and based on GM previous years are at a HP cost penalty of around 5hp. I noticed my car picked up some power and is a tad bit louder and more aggressive sounding with the secondary cats gone now.

pavetim · 10-25-2020, 02:20 PM

Ok primary cats are closest to the manifolds? Thise ones i would not think are monitored because the o2 sensors are before those cats

03-20-2017, 09:33 PM	#15
Antista1974 Drives: 2016 Camaro 2ss 2nd cat delete Join Date: Jan 2017 Location: San Antonio Posts: 34	Attached Images

03-20-2017, 09:54 PM	#16
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,860	Hum, been around for a while, still can't figure out why you want to delete one of the cats? Make it louder, for a couple hp, check engine light? So explain. __________________ 2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff

03-21-2017, 08:11 AM	#18
bryguycbr Drives: 2016 2SS Nightfall Gray Join Date: Apr 2016 Location: North Texas Posts: 131	Installed Stainless Works catback with AFM valves, secondary cats removed, CEL P0420, replaced cat on driver side, all is good now, all parts covered under factory warranty. Exhaust sounds awesome, I have 11,000 miles and every thing works great. __________________ 2016 2SS, Nightfall Gray Metallic, Jet Black Leather, A8, MRC, Clear-Bra, ROTO-FAB CAI sound tube removed, Stainless Works Catback with AFM valves, ORACLE ghosted sidemarker set

03-21-2017, 08:57 AM	#19
KyBoy Drives: '17 2SS H50 Join Date: Mar 2016 Location: Louisa, Ky Posts: 3,952	I have Borla S-Type 11924 & 60606. Replaced all this heavy junk. Car sounds awesome and feels like it can just breathe now. No CEL. Attached Images __________________ 2017 H50-2SS-MN6-F55-NPP-RIK-WL4-IO6 1100 - 5/26 0000 - Cancelled - 7/5 Contacted Becky - 7/1 2000 - 7/5 3000 - 7/6 3000 - 7/11 TPW 8/1 3100 - 7/18 TPW 8/1 3300 - 7/20 3400 - 7/21 Built - 8/2 - PS 1,182/1 of 699US 4300 - 8/3 5000 - 8/5 6000 - 8/13 Last edited by KyBoy; 03-21-2017 at 11:01 AM.

03-21-2017, 11:00 AM	#20
cmeJATT Drives: SS-6-SPD Join Date: Jan 2017 Location: New Jersey Posts: 1,364	i replaced mine by cutting it out and welding in straight pipe from muffler shop

03-21-2017, 09:25 PM	#21
Antista1974 Drives: 2016 Camaro 2ss 2nd cat delete Join Date: Jan 2017 Location: San Antonio Posts: 34	Well my car dropped about 8 lbs and sounds much better when I open the throttle up it screams........as far as power....doubt I gained any. Cold intake in the mail so maybe this week I can feel a power difference...maybe.

10-25-2020, 02:20 PM	#25
pavetim Drives: firebird Join Date: Jan 2010 Location: valdosta, georgia Posts: 155	Ok primary cats are closest to the manifolds? Thise ones i would not think are monitored because the o2 sensors are before those cats

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