Second cat delete exhaust noise

SCCamaro22 · 07-28-2022, 08:11 AM

Just recently had a shop remove my second cats on my 2020 camaro ss. Shop screwed it up the first time (exhaust leak/hissing noise, engine light,) and had to take it back for them to fix it. They fixed it, said it sealed and checked for exhaust leaks, but still have a weird "hissing noise". I sent them a video (dont know how to attach video) explaining the sound but they said it's normal engine noise. Just trying to find out if it truly is engine noise or another exhaust Leak. Anyone else with second cat delete with this noise?

Ventmaster · 07-28-2022, 02:35 PM

I was fortunate enuff to grab a Borla bolt-on 2nd cat delete X-pipe (no longer available) and there is no hiss with a 2nd cat being gone.

I'd get a 2nd (no pun intended) opinion.

joekd · 07-28-2022, 04:40 PM

I never noticed any hiss on mine after the delete

xqwisit23 · 07-28-2022, 05:10 PM

Quote:

Originally Posted by Ventmaster

I was fortunate enuff to grab a Borla bolt-on 2nd cat delete X-pipe (no longer available) and there is no hiss with a 2nd cat being gone.

I'd get a 2nd (no pun intended) opinion.

I'm late to the party but why did Borla discontinue this part? was it failure related or emission related? Seems like there is still a market for it.

Keko · 07-28-2022, 05:19 PM

Quote:

Originally Posted by xqwisit23

I'm late to the party but why did Borla discontinue this part? was it failure related or emission related? Seems like there is still a market for it.

It's emissions related. Corsa also stopped offering the secondary cat delete pipe.

1badtie · 07-28-2022, 08:25 PM

Sounds like a botched job just take it somewhere else and have them fix it if they claim nothing is wrong some people suck at customer service.

1badtie · 07-30-2022, 03:55 PM

update?

SCCamaro22 · 07-30-2022, 04:25 PM

Sorry for not updating been a hectic schedule. I took the car somewhere else and truly saw how bad the first shop did (borderline dangerous). I'll post the pictures of the before and after. I'm in the process of getting a refund and the car sounds amazing now! Thanks for the help! Made my decision to go with someone else easy!

goata8 · 07-30-2022, 05:59 PM

Looks great now. I've dealt with hackjobs from previous owners on cars before. Not fun. Glad you got it fixed up.

Ventmaster · 07-31-2022, 12:58 PM

OMG, LOL funny if it weren't so sad! Can you say "amateur" welder?

Good ear for picking up that "hiss"!

cmitchell17 · 08-10-2022, 08:48 PM

Looks like they either ran out of gas and switched to flux core wire (even if your a "good" welder flux core will always look like crap) or like someone else said they just had no idea what they were doing.

Besides that how did it sound after (when it was done properly of course) compared to stock? or was it stock before? NPP?

shippingguy · 08-11-2022, 12:37 AM

Quote:

Originally Posted by cmitchell17

Looks like they either ran out of gas and switched to flux core wire (even if your a "good" welder flux core will always look like crap) or like someone else said they just had no idea what they were doing.

Besides that how did it sound after (when it was done properly of course) compared to stock? or was it stock before? NPP?

I did mine a couple weeks ago. Its not a lot louder, but a nice increase in sound a bit deeper tone.

WhiteMale · 08-11-2022, 07:31 AM

That's an insane weld job holy cow

joekd · 08-11-2022, 08:42 AM

Damn that first job was done poorly

Yours now looks just like my 2nd cat delete

07-28-2022, 08:11 AM	#1
SCCamaro22 Drives: Chevrolet Camaro Join Date: Jul 2022 Location: GA Posts: 2	Second cat delete exhaust noise Just recently had a shop remove my second cats on my 2020 camaro ss. Shop screwed it up the first time (exhaust leak/hissing noise, engine light,) and had to take it back for them to fix it. They fixed it, said it sealed and checked for exhaust leaks, but still have a weird "hissing noise". I sent them a video (dont know how to attach video) explaining the sound but they said it's normal engine noise. Just trying to find out if it truly is engine noise or another exhaust Leak. Anyone else with second cat delete with this noise? Last edited by SCCamaro22; 07-28-2022 at 09:19 AM.

07-28-2022, 04:40 PM	#3
joekd Drives: 2018 Camaro SS vert Join Date: Oct 2020 Location: CT Posts: 449	I never noticed any hiss on mine after the delete __________________

07-28-2022, 08:25 PM	#6
1badtie Drives: 2018 Camaro ZL1 Join Date: Nov 2009 Location: Central Arkansas Posts: 1,214	Sounds like a botched job just take it somewhere else and have them fix it if they claim nothing is wrong some people suck at customer service. __________________ 2018 ZL1 M6 NGM PPF and Ceramic coating IG: NGMZL1 2010 2SS RS --- SOLD MODS- Performance: BMR trailing arms & bushings \| BMR Toe links \| X-pipe \| Muffler delete \| Vmax ported throttle body \| Apex "strong" MAS \| Vararam CAI \| Apex catch can \| Kooks Headers \| Kooks HF Cats \| Dyno tuned by GPI 417 RWHP 409 FT-Lb Cosmetic: painted Zl1 rockers \| Zl1 grill \| AAC side markers \| AAC LED backup lights \| windows tint \| taillight tint \| JDP tow hook \| all emblems blacked out \| LED fogs

07-30-2022, 03:55 PM	#7
1badtie Drives: 2018 Camaro ZL1 Join Date: Nov 2009 Location: Central Arkansas Posts: 1,214	update? __________________ 2018 ZL1 M6 NGM PPF and Ceramic coating IG: NGMZL1 2010 2SS RS --- SOLD MODS- Performance: BMR trailing arms & bushings \| BMR Toe links \| X-pipe \| Muffler delete \| Vmax ported throttle body \| Apex "strong" MAS \| Vararam CAI \| Apex catch can \| Kooks Headers \| Kooks HF Cats \| Dyno tuned by GPI 417 RWHP 409 FT-Lb Cosmetic: painted Zl1 rockers \| Zl1 grill \| AAC side markers \| AAC LED backup lights \| windows tint \| taillight tint \| JDP tow hook \| all emblems blacked out \| LED fogs

07-30-2022, 04:25 PM	#8
SCCamaro22 Drives: Chevrolet Camaro Join Date: Jul 2022 Location: GA Posts: 2	Sorry for not updating been a hectic schedule. I took the car somewhere else and truly saw how bad the first shop did (borderline dangerous). I'll post the pictures of the before and after. I'm in the process of getting a refund and the car sounds amazing now! Thanks for the help! Made my decision to go with someone else easy! Attached Images

07-28-2022, 02:35 PM	#2
Ventmaster Drives: 2017 1SS 6spd Join Date: Jan 2011 Location: Utah Posts: 2,869	I was fortunate enuff to grab a Borla bolt-on 2nd cat delete X-pipe (no longer available) and there is no hiss with a 2nd cat being gone. I'd get a 2nd (no pun intended) opinion.

07-30-2022, 05:59 PM	#9
goata8 Drives: 2023 LT1 A10 Join Date: May 2017 Location: Palma Sola, FL Posts: 141	Looks great now. I've dealt with hackjobs from previous owners on cars before. Not fun. Glad you got it fixed up. __________________ 2023 LT1, A10, NPP, Tech, Recaros, BVFKQ6 (Ordered 6/24, TPW 7/25, Built 8/1, Picked Up 10/3) Past: 2017 1SS A8, 1998 SS M6, 1995 Z28 M6

07-31-2022, 12:58 PM	#10
Ventmaster Drives: 2017 1SS 6spd Join Date: Jan 2011 Location: Utah Posts: 2,869	OMG, LOL funny if it weren't so sad! Can you say "amateur" welder? Good ear for picking up that "hiss"!

08-10-2022, 08:48 PM	#11
cmitchell17 Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016 Location: US Posts: 1,201	Looks like they either ran out of gas and switched to flux core wire (even if your a "good" welder flux core will always look like crap) or like someone else said they just had no idea what they were doing. Besides that how did it sound after (when it was done properly of course) compared to stock? or was it stock before? NPP?

08-11-2022, 07:31 AM	#13
WhiteMale Drives: 23 ZL1 A10 Rapid Blue Join Date: Aug 2020 Location: MO Posts: 1,990	That's an insane weld job holy cow

08-11-2022, 08:42 AM	#14
joekd Drives: 2018 Camaro SS vert Join Date: Oct 2020 Location: CT Posts: 449	Damn that first job was done poorly Yours now looks just like my 2nd cat delete Attached Images __________________

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