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Old Jan 9, 2016 | 08:02 PM
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Default Exhaust question

I'm new to the C6 and LS platform, so please be patient.

I have a 2012 GS.
I am installing CAI, cam, push rods, truniun upgrade, Kooks 1 7/8 headers and X pipe with no cats, but I am going into the stock axle backs.
I like the relatively quiet sound of the stock mufflers opposed to the noisy aftermarket setups.
My question is, is this common to do?
I mean, I know most people like the loud pipes, but are there folks that do it the way I want too, and does it rob HP from what I would normally gain on an aftermarket setup?

Thanks in advance.
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Old Jan 9, 2016 | 08:44 PM
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Kooks and cat-less X W/NPP --

Dyno-tune, Toggle switch mild/wild makes this old man young again



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Old Jan 9, 2016 | 08:51 PM
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You do understand (cam) will mean tuning. Prices vary but my time on dyno was $550.00

And in my other post I assumed you have NPP mufflers.
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Old Jan 9, 2016 | 08:55 PM
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Yessir, I am tuning thru the builder. He uses Pat G.
NPP??
I assume the stock GS?? Yes....See?? I told ya I was new to this, hahaha
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Old Jan 9, 2016 | 09:00 PM
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If you have the NPP, and I'm pretty sure you do. You will enjoy the setup, NPP will open and give you the power you need, and be quite normally.

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Old Jan 9, 2016 | 09:30 PM
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LS3 430hp ---NPP mufflers +6hp total 436 hp ==== 4 tips two center tips have a valve in them. Lets exhaust out sooner making it louder with more hp. Go figure !!!

https://www.google.com/search?q=corv...4juk5RugM%253A
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Old Jan 9, 2016 | 10:48 PM
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Stock pipes, 1200+rwhp.
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Old Jan 9, 2016 | 11:34 PM
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Yep. I have the valves. Thanks for the input. I won't worry about changing them. I like the way it sounds now.
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Old Jan 10, 2016 | 12:18 AM
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I had npp and loved them but went heads and cam with 1 7/8 primaries and 3 inch x pipe so changed the axel back to 3 inch Corza sport no cats and is loud behind the car but no drone and no radio needed as my 8 member band provides all my favorite tunes and amazing rythim true quad channels/loud speakerz there ain't no better tunes and the pps? gone for good siriously.
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Old Jan 10, 2016 | 03:28 PM
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Originally Posted by Unreal
Stock pipes, 1200+rwhp.

Does this apply to the 2.5in NPP mufflers? Or just the 3in z06 versions?
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Old Jan 10, 2016 | 04:37 PM
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Mine is z06, but they do neck down to 2.5 either way at the mufflers.Friend is making 1490rwhp on stock z06 system. I don't see the 2.5" having any issue even at 1000rwhp.
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Old Jan 10, 2016 | 04:39 PM
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I have the base NPP mufflers and making 1000 with no issue.
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Old Jan 10, 2016 | 06:52 PM
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Originally Posted by Unreal
Mine is z06, but they do neck down to 2.5 either way at the mufflers.Friend is making 1490rwhp on stock z06 system. I don't see the 2.5" having any issue even at 1000rwhp.
Originally Posted by realcanuk
I have the base NPP mufflers and making 1000 with no issue.
Wow that's amazing guys. I never knew that. I was going to go with different 3in mufflers, but I'll just keep the NPP if they do that well!
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Old Jan 12, 2016 | 12:52 PM
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Originally Posted by SLEEPERBUSA
I'm new to the C6 and LS platform, so please be patient.

I have a 2012 GS.
I am installing CAI, cam, push rods, truniun upgrade, Kooks 1 7/8 headers and X pipe with no cats, but I am going into the stock axle backs.
I like the relatively quiet sound of the stock mufflers opposed to the noisy aftermarket setups.
My question is, is this common to do?
I mean, I know most people like the loud pipes, but are there folks that do it the way I want too, and does it rob HP from what I would normally gain on an aftermarket setup?

Thanks in advance.
Hi SLEEPERBUSA, it is not uncommon for folks to run similar setups as discussed, to factory mufflers. Like you said, that will be the quietest way to do it. It will affect your performance numbers, but minimally. If you lose 10hp from having stock axelback on 500+ rwhp that's really not too much.

Happy to help if you have any other questions. Feel free to call us anytime at 443-730-9428
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Old Jan 12, 2016 | 05:44 PM
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I would suggest high flow cats as opposed to no cats if you are worried about being too loud.
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