Exhaust Question
Instructor
Joined: Jun 2021
Posts: 100
Likes: 24
From: Lakeland, FL
#15 on 17 GS. I pulled mine. Still not loud enough for me. I'm thinking about going after market. Can't decide which exhaust to go with. I like loud and aggressive.
Moderator emeritus
Joined: Jun 2001
Posts: 18,599
Likes: 3,954
From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
2015 C7 of the Year Finalist
Engine bay fuse box:
For the 2014, it is fuse 41.
For the 2015 - 2018 it is fuse 42.
For the 2019 - it is fuse 87
I have the M2W. I can run it with the NPP open or closed with a push of the visor buttons. It starts open when I start the car. If I don't touch the right button on the visor, it stays open. Press the right button and the NPP closes. If I want to reopen the NPP, I just press the left button and it's back open. I can open/close it without leaving the driver's seat.
Elmer
For the 2014, it is fuse 41.
For the 2015 - 2018 it is fuse 42.
For the 2019 - it is fuse 87
I have the M2W. I can run it with the NPP open or closed with a push of the visor buttons. It starts open when I start the car. If I don't touch the right button on the visor, it stays open. Press the right button and the NPP closes. If I want to reopen the NPP, I just press the left button and it's back open. I can open/close it without leaving the driver's seat.
Elmer
Cruising
Joined: Aug 2011
Posts: 10
Likes: 13
From: St. Louis, MO
Well - this is my first post- and the best way to kick it off here would be by asking a silly question, right?
So... How do I know if I have NPP exhaust? If I'm able to access Engine sound management in the setting screen? Does that mean I have NPP?
Also... Jesus.. These exhaust systems are expensive.
So... How do I know if I have NPP exhaust? If I'm able to access Engine sound management in the setting screen? Does that mean I have NPP?
Also... Jesus.. These exhaust systems are expensive.
Instructor
Joined: Mar 2019
Posts: 186
Likes: 118
From: Kansas
Welcome! If your exhaust tips are bell shaped you have NPP exhaust. Also there is a spid label under the carpet in the right rear that shows all the RPO codes for your car. It will have NPP on that sticker if you have it.
Also look in the 2 outside pipes and if so equipped you will see a butterfly valve about 6” in.
Regards, Jeff
Also look in the 2 outside pipes and if so equipped you will see a butterfly valve about 6” in.
Regards, Jeff
Cruising
Joined: Aug 2011
Posts: 10
Likes: 13
From: St. Louis, MO
Welcome! If your exhaust tips are bell shaped you have NPP exhaust. Also there is a spid label under the carpet in the right rear that shows all the RPO codes for your car. It will have NPP on that sticker if you have it.
Also look in the 2 outside pipes and if so equipped you will see a butterfly valve about 6” in.
Regards, Jeff
Also look in the 2 outside pipes and if so equipped you will see a butterfly valve about 6” in.
Regards, Jeff
These look round - 🤔 But are you referring to the flange?
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Cruising
Joined: Aug 2011
Posts: 10
Likes: 13
From: St. Louis, MO
I currently have the engine sound management set to track.
will there be a difference in sound if I pull the 42 fuse under the hood?
or is the track mode the same as valves being open all the time?
Moderator emeritus
Joined: Jun 2001
Posts: 18,599
Likes: 3,954
From: Jacksonville Florida BWO Dayton, Cincinnati, Bloomsbury NJ, Cincinnati
2015 C7 of the Year Finalist
Le Mans Master
Joined: Nov 2015
Posts: 7,382
Likes: 3,501
From: Lake Havasu City Arizona
Pulling the fuse defeats the valves and they remain wide open at all times.
Pro
Joined: Oct 2002
Posts: 542
Likes: 311
From: Annapolis MD
Another vote for the AWE Touring exhaust.
I have a Z06 that came with NPP's. Added the CAI, Added the Borla Xpipe...and it increased the sound, but it still had a muffled sound to it.
When I put on the AWE's it came to life with a much cleaner deeper sound. It sounds crazy when you get on it, but really quiets down at slow speeds or in upper gears.
With NPP's (+ CAI and Xpipe)
After AWE Touring
That's mine in the lower right corner at 9 seconds into this video.
I have a Z06 that came with NPP's. Added the CAI, Added the Borla Xpipe...and it increased the sound, but it still had a muffled sound to it.
When I put on the AWE's it came to life with a much cleaner deeper sound. It sounds crazy when you get on it, but really quiets down at slow speeds or in upper gears.
With NPP's (+ CAI and Xpipe)
After AWE Touring
That's mine in the lower right corner at 9 seconds into this video.
Last edited by 97titan; Mar 29, 2023 at 10:30 AM.
Intermediate
Joined: Mar 2019
Posts: 39
Likes: 35
From my experience, just pulling the fuse a little and I mean a little bit louder.
Fuse pulled with midpipe nice sound, even louder but I wanted more. Still tame IMO
Now I have midpipe and AWE track axle back and it’s LOUD. I love it but may be too much for some. Haven’t heard the touring in person so couldn’t say what that would sound like and if it would suit you. If pulling the fuse doesn’t do it for you and you don’t mind losing NPP then add aftermarket exhaust for sure.
Fuse pulled with midpipe nice sound, even louder but I wanted more. Still tame IMO
Now I have midpipe and AWE track axle back and it’s LOUD. I love it but may be too much for some. Haven’t heard the touring in person so couldn’t say what that would sound like and if it would suit you. If pulling the fuse doesn’t do it for you and you don’t mind losing NPP then add aftermarket exhaust for sure.
Racer
Joined: Jan 2020
Posts: 426
Likes: 197
From: Boston
Here’s a pic of the valves open when parked and the fuse pulled.
Racer
Joined: Aug 2011
Posts: 373
Likes: 75
From: Iron Station, NC
Safety Car
Joined: Mar 2006
Posts: 4,547
Likes: 5,147
From: Chester VA
Yes, there is a great post that's been copied at least once that has photos of both exhaust types. I wish I could find it, but I wouldn't know where to begin. Ideally, someone who knows the photo will re-post for you.
If you want to clean up your exhaust tips, Mother's Mag Wheel Polish or Bar Keeper's Friend powdered cleanser will make them look like new.