06-30-2020, 12:04 PM | #1 |
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Primary cat delete sound?
I'd like to install some primary cat delete pipes on my SS. How much louder does it get when the secondaries and NPP muffler are still in place? I usually love the raspier, more exotic sound you get with a cat delete, so these look interesting to me.
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06-30-2020, 12:30 PM | #2 |
Drives: SS A8, NPP, Red Hot Join Date: Jan 2019
Location: Toledo, OH
Posts: 583
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I'd start with deleting the secondary cats and an exhaust if you can swing it, and see how you like it.
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06-30-2020, 04:58 PM | #3 |
Drives: R.I.P. 2021 ZL1 & 2019 Rd Garn 2SS Join Date: Dec 2019
Location: Chattanooga, TN
Posts: 268
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I would love to know this answer and see videos. Not many videos out their with that setup. Most of the setups are with cam or a lot of other mods. I have some CA Primary cat deletes that I'm waiting to install on my girlfriend car and get tuned when her warranty is up. We are wanting more volume. Was thinking of the secondary cat delete but I don't think that's going to increase it much with the stock system. So Primary cat delete it's going to be plus install price will be a lot cheaper than header install price.
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06-30-2020, 05:06 PM | #4 |
Drives: chevy camaro Join Date: Jan 2019
Location: minnesota
Posts: 13
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i have secondary cat delete with stock muffler. it sounds more deep and a bit louder. once you step on it, you can hear it. i dont have a clip.
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06-30-2020, 06:15 PM | #5 |
Drives: like an old lady Join Date: Jun 2012
Location: indiana
Posts: 2,396
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2016+ camaro: everyone’s first car
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07-01-2020, 02:53 AM | #6 |
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Deleting the secondaries requires cutting the exhaust. Aftermarket mufflers that work with NPP start at $1200 and also require cutting. Primary cat delete pipes are about $400 and a tune is $500, so you're all in for about $900. It's also completely reversible and I can sell the pipes when I'm done with the car. All of this makes it a much more attractive option, IMO.
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07-01-2020, 05:26 AM | #7 |
Drives: 2018 1SS M6 Join Date: Nov 2014
Location: Houston
Posts: 2,617
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If it were me, and I was going to delete the cats, I would just go ahead with Long Tubes and off road pipes.
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07-01-2020, 06:54 AM | #8 | |
Drives: SS A8, NPP, Red Hot Join Date: Jan 2019
Location: Toledo, OH
Posts: 583
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07-01-2020, 08:42 AM | #9 | |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
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It makes the sound significantly louder. Keeping the secondaries in place help tame it down some. The factory cat pipes are the main bottle neck in the exhaust system.
Here is a vid of the car when I had bolt-on primary cat deletes retaining the secondary cats and stock NPP.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
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07-01-2020, 09:28 AM | #10 |
Drives: SS 6 speed of course Join Date: Jan 2016
Location: Hilo, HI
Posts: 4,320
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word. IMO the car sounds and runs the best with primary cats. I modified my stock ones. For headers, one of my best mods, was to add cats to the headers. I have an M6, the autos seem to function / sound better with primary cat deletes. Mine sounded like hollow cans banging around...
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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07-01-2020, 05:31 PM | #11 | ||
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My car barely has any PT warranty left. I don't really care at this point. |
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07-01-2020, 05:49 PM | #12 | ||
Drives: R.I.P. 2021 ZL1 & 2019 Rd Garn 2SS Join Date: Dec 2019
Location: Chattanooga, TN
Posts: 268
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07-01-2020, 11:21 PM | #13 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
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It was stock still on the paper tags lol. I ended up selling them because the car ran better with the cats on the stock tune. Once I did bolt-ons and E85, I picked up a set of CA performance pipes and have been running them ever since. They work great with proper tuning.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
05-17-2022, 05:55 AM | #14 | ||
ZL1 Believer
Drives: 2019 Camaro ZL1 Join Date: Oct 2020
Location: Bangkok, Thailand
Posts: 532
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