DIY Cat Delete (Secondary)

infinitereality · 11-19-2021, 01:35 PM

I've been wanting to ditch my secondary cats and all muffler shops are closed on weekends around my area so kicking around DIY options. Originally was going to just let them delete the cats and weld new tips on, but since there's no place open on weekends since the hurricanes I decided to just install the tips myself and looking to do the same for the cat delete now.

Looking at pictures and measuring, 12" piece of straight pipe could get slipped on and welded in place of the cats. While I do have a welder, I don't have any 3" pipe nor do I think I will be able to weld on the top of pipes.

Would it be as simple as taking a sawzall to cutout my secondary cats and replacing it with something like this (to compensate for the passenger side's slight bend) and some 3" clamps? Open to other suggestions.

https://www.summitracing.com/parts/aph-8853

Pics of the carbon fiber exhaust tips straight from china for attention, and a random cat delete pic I found a while back.

DangerZL1 · 11-19-2021, 04:23 PM

This is one of those mods you’ll probably have to do yourself anyway. Most exhaust shops won’t remove a cat unless it needs to be replaced due to potential fines.

ZL1plumbin · 11-19-2021, 07:37 PM

So in theory borla, awe, corsa link pipes should work with other exhaust brands?
I’m really hoping to score a system or link pipes from someone that sold the car etc

Wuiquen · 11-19-2021, 08:21 PM

Are those pics welded to the stock mufflers? I'm assuming your NPP still works?

infinitereality · 11-19-2021, 10:29 PM

Any input on if the flex pipe in link would work?

Quote:

Originally Posted by Wuiquen

Are those pics welded to the stock mufflers? I'm assuming your NPP still works?

Had intended to get them welded when I deleted the cat but got tired of waiting. Just sawzall the factory tips and these are clamped on. 63mm inlet and 114mm outlet. Same OD as stock tips, but look larger due to no flare.

Wuiquen · 11-19-2021, 10:38 PM

Quote:

Originally Posted by infinitereality

Any input on if the flex pipe in link would work?

Had intended to get them welded when I deleted the cat but got tired of waiting. Just sawzall the factory tips and these are clamped on. 63mm inlet and 114mm outlet. Same OD as stock tips, but look larger due to no flare.

Could you share with me where you got those tips from? I might be interested on getting something similar

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joekd · 11-20-2021, 02:36 PM

My cat delete pipes are not straight at all and have a few bends to them

Firecaptain · 11-21-2021, 12:23 PM

The AWE had some twists and turns in them.....

rwarden90@gmail.com · 11-21-2021, 04:44 PM

Interested as I have a similar issue finding link pipes for my delete and installing headers. Im in florida so emissions isnt an issue but alot of shops are still weary. Right now Im using cats that where hollowed out but they resonate at 2k-2.3k rpm and its annoying.

infinitereality · 11-21-2021, 11:27 PM

Looks like the flex pipe from link won't work, I don't believe they'll bend that much. I know.they make actual flexible pipe but it would definitely look ike a hack job

As for tips, 63mm in and 114mm out
https://a.aliexpress.com/_mqG4yCO

infinitereality · 11-21-2021, 11:53 PM

Also in notes I request no logo when I ordered. Planned on leaving blank, but other day has a few minutes so added my own logo in satin black. No one will ever notice it.

Spaceme1117 · 11-22-2021, 05:29 AM

Why not just put a set of Kooks long tube headers instead? They bolt to the factory exhaust after you cut each side.

infinitereality · 11-22-2021, 08:13 AM

Quote:

Originally Posted by Spaceme1117

Why not just put a set of Kooks long tube headers instead? They bolt to the factory exhaust after you cut each side.

At this point, not wanting to go with headers until ready for a tune. being a '18 leary about tuning until I feel okay oil pump isn't going to let go at some point. Just want a little more volume currently, more so something I can do myself in my shop.

Wuiquen · 11-30-2021, 10:08 PM

Quote:

Originally Posted by Spaceme1117

Why not just put a set of Kooks long tube headers instead? They bolt to the factory exhaust after you cut each side.

Which set would that be? And do they probably the connectors to attach to the stock exhaust?

How does one measure for cutting?

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11-19-2021, 01:35 PM	#1
infinitereality Limitless Imagination Drives: 2018 ZL1 & 2022 Hayabusa Join Date: Dec 2016 Location: Louisiana Posts: 473	DIY Cat Delete (Secondary) I've been wanting to ditch my secondary cats and all muffler shops are closed on weekends around my area so kicking around DIY options. Originally was going to just let them delete the cats and weld new tips on, but since there's no place open on weekends since the hurricanes I decided to just install the tips myself and looking to do the same for the cat delete now. Looking at pictures and measuring, 12" piece of straight pipe could get slipped on and welded in place of the cats. While I do have a welder, I don't have any 3" pipe nor do I think I will be able to weld on the top of pipes. Would it be as simple as taking a sawzall to cutout my secondary cats and replacing it with something like this (to compensate for the passenger side's slight bend) and some 3" clamps? Open to other suggestions. https://www.summitracing.com/parts/aph-8853 Pics of the carbon fiber exhaust tips straight from china for attention, and a random cat delete pic I found a while back. Attached Images __________________ 2018 Camaro ZL1 - Black - OEM Options: A10, Exposed Carbon, PVR, Nav, No Sunroof - Lightly Tinted GM Dark Tails, DD Side Markers, Morimoto 5000k, 100% LED - RotoFab Dry, Forgestar CF5V (ZLE Spec), Eibach Pro, AeroForce Interceptor, GT4 Tow Hook - Carbon Fiber (Satin): Radio, Shifter, Steering Wheel Controls, Shifter Top, AC Vents, Side Mirrors & Shark Fin 2022 Suzuki Hayabusa - Brilliant White Pearl & Shocker Yellow Wheels - +4 Arm, 240 OEM Wheel, Brock's CT (Ti) Exhaust, 1.25" drop, etc... Last edited by infinitereality; 11-19-2021 at 01:54 PM.

11-19-2021, 08:21 PM	#4
Wuiquen Drives: 2018 Hot Red ZL1 Join Date: Nov 2010 Location: Los Angeles, CA Posts: 3,599	Are those pics welded to the stock mufflers? I'm assuming your NPP still works? __________________

11-20-2021, 02:36 PM	#7
joekd Drives: 2018 Camaro SS vert Join Date: Oct 2020 Location: CT Posts: 449	My cat delete pipes are not straight at all and have a few bends to them Attached Images __________________

11-21-2021, 12:23 PM	#8
Firecaptain Drives: '22 Summit White ZL1 A10 Join Date: Aug 2019 Location: Virginia Posts: 459	The AWE had some twists and turns in them..... Attached Images

11-21-2021, 11:27 PM	#10
infinitereality Limitless Imagination Drives: 2018 ZL1 & 2022 Hayabusa Join Date: Dec 2016 Location: Louisiana Posts: 473	Looks like the flex pipe from link won't work, I don't believe they'll bend that much. I know.they make actual flexible pipe but it would definitely look ike a hack job As for tips, 63mm in and 114mm out https://a.aliexpress.com/_mqG4yCO __________________ 2018 Camaro ZL1 - Black - OEM Options: A10, Exposed Carbon, PVR, Nav, No Sunroof - Lightly Tinted GM Dark Tails, DD Side Markers, Morimoto 5000k, 100% LED - RotoFab Dry, Forgestar CF5V (ZLE Spec), Eibach Pro, AeroForce Interceptor, GT4 Tow Hook - Carbon Fiber (Satin): Radio, Shifter, Steering Wheel Controls, Shifter Top, AC Vents, Side Mirrors & Shark Fin 2022 Suzuki Hayabusa - Brilliant White Pearl & Shocker Yellow Wheels - +4 Arm, 240 OEM Wheel, Brock's CT (Ti) Exhaust, 1.25" drop, etc...

11-19-2021, 04:23 PM	#2
DangerZL1 Drives: 2023 Black ZL1 Auto Join Date: Oct 2009 Location: FEMA Region 4 Posts: 2,935	This is one of those mods you’ll probably have to do yourself anyway. Most exhaust shops won’t remove a cat unless it needs to be replaced due to potential fines.

11-19-2021, 07:37 PM	#3
ZL1plumbin Drives: ZL1 1LE on order Join Date: Nov 2021 Location: MI Posts: 177	So in theory borla, awe, corsa link pipes should work with other exhaust brands? I’m really hoping to score a system or link pipes from someone that sold the car etc

11-21-2021, 04:44 PM	#9
rwarden90@gmail.com Rwarden90 Drives: 2018 Camaro ZL1 Join Date: Jan 2021 Location: Port Orange Florida Posts: 12	Interested as I have a similar issue finding link pipes for my delete and installing headers. Im in florida so emissions isnt an issue but alot of shops are still weary. Right now Im using cats that where hollowed out but they resonate at 2k-2.3k rpm and its annoying.

11-21-2021, 11:53 PM	#11
infinitereality Limitless Imagination Drives: 2018 ZL1 & 2022 Hayabusa Join Date: Dec 2016 Location: Louisiana Posts: 473	Also in notes I request no logo when I ordered. Planned on leaving blank, but other day has a few minutes so added my own logo in satin black. No one will ever notice it. Attached Images __________________ 2018 Camaro ZL1 - Black - OEM Options: A10, Exposed Carbon, PVR, Nav, No Sunroof - Lightly Tinted GM Dark Tails, DD Side Markers, Morimoto 5000k, 100% LED - RotoFab Dry, Forgestar CF5V (ZLE Spec), Eibach Pro, AeroForce Interceptor, GT4 Tow Hook - Carbon Fiber (Satin): Radio, Shifter, Steering Wheel Controls, Shifter Top, AC Vents, Side Mirrors & Shark Fin 2022 Suzuki Hayabusa - Brilliant White Pearl & Shocker Yellow Wheels - +4 Arm, 240 OEM Wheel, Brock's CT (Ti) Exhaust, 1.25" drop, etc...

11-22-2021, 05:29 AM	#12
Spaceme1117 Drives: 2017 Camaro SS, 2011 Corvette GS Join Date: Feb 2019 Location: Erlanger, Kentucky 41018 Posts: 815	Why not just put a set of Kooks long tube headers instead? They bolt to the factory exhaust after you cut each side.

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