Does Secondary Cat Delete Increase Pops? Cause CEL?

mjk3888 · 05-11-2017, 03:21 PM

Those of you with secondary cat deletes does the car seem to pop and crackle more on the over run? I'm looking to remove mine tomorrow.

Also have you guys had issues getting the welds done right to prevent the Check Engine Light?

Hagels316 · 05-11-2017, 03:55 PM

before I put LTs on and a catback I drove around for about a month or so with the 2nd cats removed (welded straight pipes). No CEL at all and yes there were more noticeable pops and crackles (louder too).

pinoyscorpion951 · 05-11-2017, 04:28 PM

Yup, before I was running headers with high flows, I had the secondary cat deletes and there was a noticeable increase in the pops and gurgles on deceleration.

TJay74 · 05-11-2017, 08:30 PM

Yep, same here.

exxit · 05-12-2017, 12:10 AM

Also, pull the fuse bruv. The NPP closes itself on decel. Much more noticeable when you have both cats deleted (because the puny valves rattle like crazy)

mjk3888 · 05-12-2017, 07:35 AM

I love hearing the overrun pops and bangs. I'm pumped to hear it even more.

FYI
Added a poll. Those of you who had this done please vote on if you did or didn't have Check Engine Light issues afterwards.

FlashBang23 · 05-12-2017, 07:54 AM

In for results......my last car (15 5.0 with roush axleback and x pipe) was crazy loud and made tons of pops and gurgles on decel. That is the one thing I do miss from that car on my 1LE. Hoped that the Borla S Type with x pipe would fix things but it isn't quite agressive enough for me.

FlashBang23 · 05-12-2017, 08:01 AM

Quote:

Originally Posted by exxit

Also, pull the fuse bruv. The NPP closes itself on decel. Much more noticeable when you have both cats deleted (because the puny valves rattle like crazy)

It closes itself even in track mode?

SuperSound · 05-12-2017, 08:13 AM

Quote:

Originally Posted by FlashBang23

It closes itself even in track mode?

Yep, at part throttle and cruising too.

FlashBang23 · 05-12-2017, 08:19 AM

Quote:

Originally Posted by SuperSound

Yep, at part throttle and cruising too.

Cool, i knew it did cruising but did not realize it closed it on decel. Fuse will be out before I leave work for lunch today lol.

SS 1LE · 05-12-2017, 08:30 AM

Quote:

Originally Posted by FlashBang23

Cool, i knew it did cruising but did not realize it closed it on decel. Fuse will be out before I leave work for lunch today lol.

Fuse 51.

Mighunter · 05-12-2017, 09:29 AM

Quote:

Originally Posted by Hagels316

before I put LTs on and a catback I drove around for about a month or so with the 2nd cats removed (welded straight pipes). No CEL at all and yes there were more noticeable pops and crackles (louder too).

Not to hijack this thread, but I'm looking to upgrade to the borla s-type cat back. I keep reading on these forums that the exhaust is "welded" but when I read borla's instructions, there is no welding just clamps. Am I missing something?

Does this have to be done by a muffler shop or can i do this myself?

Hagels316 · 05-12-2017, 01:48 PM

Quote:

Originally Posted by Mighunter

Not to hijack this thread, but I'm looking to upgrade to the borla s-type cat back. I keep reading on these forums that the exhaust is "welded" but when I read borla's instructions, there is no welding just clamps. Am I missing something?

Does this have to be done by a muffler shop or can i do this myself?

I think borla offers 2 versions of the catback. One keeps the secondary cats in place the other does not. The latter (no 2nd cats) does not require any welding, it should bolt right up to the factory primary cats. Keeping the secondary cats in place will require cuts and welds.

Just make sure you order the correct one.

Mighunter · 05-12-2017, 02:16 PM

Quote:

Originally Posted by Hagels316

I think borla offers 2 versions of the catback. One keeps the secondary cats in place the other does not. The latter (no 2nd cats) does not require any welding, it should bolt right up to the factory primary cats. Keeping the secondary cats in place will require cuts and welds.

Just make sure you order the correct one.

I was looking at 60610. ok so I see the 60609 removes the secondary cats. So no welding with the 60610.

Thanks!!

View Poll Results: Did you get a Check Engine Light after removing Secondary Cats?
Yes	5	7.25%
No	64	92.75%
Voters: 69. You may not vote on this poll

05-11-2017, 03:21 PM	#1
mjk3888 "M1SS1LE" Drives: 2017 SS 1LE Join Date: Dec 2015 Location: Upstate SC Posts: 2,906	Does Secondary Cat Delete Increase Pops? Cause CEL? Those of you with secondary cat deletes does the car seem to pop and crackle more on the over run? I'm looking to remove mine tomorrow. Also have you guys had issues getting the welds done right to prevent the Check Engine Light? __________________ MJK3888 Instagram Link Last edited by mjk3888; 05-12-2017 at 07:36 AM.

05-12-2017, 07:35 AM	#6
mjk3888 "M1SS1LE" Drives: 2017 SS 1LE Join Date: Dec 2015 Location: Upstate SC Posts: 2,906	I love hearing the overrun pops and bangs. I'm pumped to hear it even more. FYI Added a poll. Those of you who had this done please vote on if you did or didn't have Check Engine Light issues afterwards. __________________ MJK3888 Instagram Link

05-12-2017, 07:54 AM	#7
FlashBang23 Drives: 2017 1LE Join Date: Jul 2016 Location: Michigan Posts: 393	In for results......my last car (15 5.0 with roush axleback and x pipe) was crazy loud and made tons of pops and gurgles on decel. That is the one thing I do miss from that car on my 1LE. Hoped that the Borla S Type with x pipe would fix things but it isn't quite agressive enough for me. __________________ 17 Summit White SS 1LE PDR / Borla S type Catback / XPEL Ultimate PPF

05-11-2017, 03:55 PM	#2
Hagels316 Drives: 2016 Camaro 2SS A8 Join Date: Dec 2015 Location: Charlotte, NC Posts: 161	before I put LTs on and a catback I drove around for about a month or so with the 2nd cats removed (welded straight pipes). No CEL at all and yes there were more noticeable pops and crackles (louder too).

05-11-2017, 04:28 PM	#3
pinoyscorpion951 Drives: 2016 Bright Yellow 2SS A8 Join Date: Jul 2014 Location: Rancho Cucamonga, California Posts: 610	Yup, before I was running headers with high flows, I had the secondary cat deletes and there was a noticeable increase in the pops and gurgles on deceleration.

05-11-2017, 08:30 PM	#4
TJay74 Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016 Location: Norman, OK Posts: 2,424	Yep, same here.

05-12-2017, 12:10 AM	#5
exxit Drives: 2016 1SS D1SC Methfed Lowered Wrapd Join Date: Apr 2016 Location: CA Posts: 632	Also, pull the fuse bruv. The NPP closes itself on decel. Much more noticeable when you have both cats deleted (because the puny valves rattle like crazy)

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