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06-01-2017, 01:01 AM
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#1 |
 
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secondary cat delete
Has anyone removed the secondary cats on their '17 ZL1? My buddy did it on his CTS V and it sounds great.
I am looking for a louder exhaust note. |
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06-01-2017, 11:33 AM
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#2 | |
   
Drives: 2017 ZL1 Join Date: Aug 2016
Location: Long Island, New York
Posts: 1,036
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06-01-2017, 12:18 PM
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#3 |
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Drives: 17 NFG ZL1 17 GTR 22 RS6 Join Date: Apr 2017
Location: Upper Marlboro MD
Posts: 625
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I thought lethal did his and he got a CEL after driving awhile?
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06-01-2017, 12:43 PM
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#4 |
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Account Suspended
Drives: 2017 Camaro ZL1 A10 Join Date: May 2012
Location: NJ
Posts: 7,692
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I wouldn't mess with the exhaust manifolds or cats until ready to have it tuned. I would not want to take the chance of getting a CEL or running lean. If you want a louder exhaust note then the quickest way to do that is to get a catback or to do the fuse pull. And that way you won't be messing up the stock exhaust pieces or getting a CEL and then having to spend even more money on a tune and void your warranty.
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06-01-2017, 01:18 PM
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#5 | |
 
Drives: 2017 ZL1 Join Date: Mar 2014
Location: DFW, TX
Posts: 302
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The secondary cats are after the 2nd O2 sensors. |
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06-06-2017, 09:06 PM
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#6 |
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Yeah to my understanding deleting the secondary cats wouldn't throw a code. I have done the fuse pull...doesnt really do much of anything. Also doing a tune would definitely void the warranty. I know, lets not get on that discussion.
Just wondering if someone has done it. I think I might do it and just see what it sounds like. Could always do a cat back later. |
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06-06-2017, 10:13 PM
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#7 |
Drives: Nothing Fast (Yet) Join Date: Oct 2015
Location: Washington
Posts: 84
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I'm 99% sure the rear cats are not monitored. You could swap the x-pipe and get rid of the secondary (rear cats). The only thing actually monitored in the exhaust is the first set of cats after the exhaust manifolds.
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06-06-2017, 11:23 PM
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#8 |
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Drives: 2017 ZL1 Join Date: Aug 2016
Location: Long Island, New York
Posts: 1,036
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Pulling the fuse does not make the exhaust louder... need to get a catback for a louder exhaust. Secondary cats are not monitored. No CEL.
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06-07-2017, 07:24 AM
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#9 |
Drives: 2017 ZL1 Join Date: Oct 2016
Location: Ny
Posts: 859
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Secondary cat del doesnt throw code unless your welder sucks. It adds a lot of rasp at wot and a bit of volume, maybe 15-20%. No added drone or rasp at normal speeds. No cel.
__________________
My Car Blog and mods. Previous Chevys: 2016 2ss, 2015 C7 z51, 2004 C5 Z06
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06-07-2017, 08:37 AM
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#10 |
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Texas Military Forces
Drives: 2017 ZL1 Red Hot Auto Join Date: Jul 2009
Location: San Antonio, TX
Posts: 181
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Sounds like you're good to good! Let me know how it sounds. I'd like to do the same.
__________________
2017 Red Hot ZL1 Automatic (Sunroof, PDR & NAV)
2/10/2017 status: ordered 2/23/2017 status: 3100 TPW 3/6/2017 3/06/2017 status: 3400 TPW 3/6/2017 3/10/2017 built 4200 VIN# 1G1FK1R65H0193462 3/18/2017 Delivered to me! 2016 Camaro 2SS (wife's car) M228 Black Wheels 2010 Camaro SS (totalled by son) |
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06-07-2017, 10:09 AM
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#11 |
 Drives: 89 Turbo Trans Am Join Date: Oct 2016
Location: Tennessee
Posts: 40
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I suppose electric cutouts pre cats (both) if there is room, would cause CEL?
Electric cutouts after both cats would for sure increase exhaust sound level without removing entire exhaust. Anyone tried cutouts yet? Doesn't look like there is room though. |
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06-07-2017, 11:37 AM
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#12 |
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Drives: 17 NFG ZL1 17 GTR 22 RS6 Join Date: Apr 2017
Location: Upper Marlboro MD
Posts: 625
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Just deleted secondary cats...not worth the money imo, could have used the money spent towards a cat back...no difference that my ears could pick up other than a slightly louder start up note which I have actually not been liking early in the morning as I have an infant in the house...lol
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06-09-2017, 01:55 AM
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#13 | |
 
Drives: 2017 ZL1 6 spd RED HOT w/ PDR Join Date: Oct 2016
Location: Imperial Beach, CA
Posts: 129
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Quote:
How much was the labor/materials if you don't mind me asking? And yeah I can relate to you...my wife hates it when I start it in the morning and the pipes are facing the house... I have a 3 year old and 6 month old, they are terrified of the ZL1!! Haha!! I pulled the fuse and noticed on the highway it's slightly louder crushing at low RPMs since the flap is kept open 100% at all times. Might be the furthest I'll go at this point if you are saying it's not worth it for the secondary cats delete. Especially since I track it and if anything happens I don't want the dealer to point the finger at me for modding the exhaust. |
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06-09-2017, 11:35 AM
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#14 | |
Drives: 2017 Ford F250, 2019 Lincoln Navi Join Date: Apr 2016
Location: Houston, TX
Posts: 391
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