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Old 06-30-2020, 12:04 PM   #1
BigGuy81
 
Drives: 2016 2SS A8/NPP/MRC
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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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Old 06-30-2020, 12:30 PM   #2
RyanR623
 
Drives: SS A8, NPP, Red Hot
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Quote:
Originally Posted by BigGuy81 View Post
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.
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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Old 06-30-2020, 04:58 PM   #3
jaybee924
 
Drives: 2019 Chevy Camaro 2SS
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Quote:
Originally Posted by BigGuy81 View Post
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.
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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Old 06-30-2020, 05:06 PM   #4
its_giooo1
 
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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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Old 06-30-2020, 06:15 PM   #5
s346k
 
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found a video of cat delete and npp

https://youtu.be/_eG3kt80M68
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Old Yesterday, 02:53 AM   #6
BigGuy81
 
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Originally Posted by RyanR623 View Post
I'd start with deleting the secondary cats and an exhaust if you can swing it, and see how you like it.
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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Old Yesterday, 05:26 AM   #7
MrChrisLS3


 
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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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Old Yesterday, 06:54 AM   #8
RyanR623
 
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Quote:
Originally Posted by BigGuy81 View Post
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.
It also voids the warranty.
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Old Yesterday, 08:42 AM   #9
KingLT1


 
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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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Old Yesterday, 09:28 AM   #10
oldman


 
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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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Old Yesterday, 05:31 PM   #11
BigGuy81
 
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Quote:
Originally Posted by KingLT1 View Post
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.

That sound badass.

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Originally Posted by RyanR623 View Post
It also voids the warranty.
My car barely has any PT warranty left. I don't really care at this point.
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Old Yesterday, 05:49 PM   #12
jaybee924
 
Drives: 2019 Chevy Camaro 2SS
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Quote:
Originally Posted by KingLT1 View Post
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.

King what all mods did you have that at that point when you shot this video? I found some well have the CA primary cat deletes just waiting about almost 4 years for the Powertrain warranty to be up on my girlfriends car. lmao
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Old Yesterday, 11:21 PM   #13
KingLT1


 
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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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