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Old May 31, 2022 | 04:17 PM
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Default Help with 2017 exhaust

Hello everyone, today i made a switch from bmw to corvette, i got it used. 2017 LT1 with 18k miles. I have one question/problem. When I put the car in track/sport mode exhaust sound doesnt change at all. i even tried it from settings, engine sound management and still no luck. Exhaust has no valves from the back when I try to look inside. What’s the issue and how can I solve this to make it loud?
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Old May 31, 2022 | 04:22 PM
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Originally Posted by orenomest
Hello everyone, today i made a switch from bmw to corvette, i got it used. 2017 LT1 with 18k miles. I have one question/problem. When I put the car in track/sport mode exhaust sound doesnt change at all. i even tried it from settings, engine sound management and still no luck. Exhaust has no valves from the back when I try to look inside. What’s the issue and how can I solve this to make it loud?
Are you sure you hve the NPP exhaust?
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Old May 31, 2022 | 04:24 PM
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Originally Posted by orenomest
Hello everyone, today i made a switch from bmw to corvette, i got it used. 2017 LT1 with 18k miles. I have one question/problem. When I put the car in track/sport mode exhaust sound doesnt change at all. i even tried it from settings, engine sound management and still no luck. Exhaust has no valves from the back when I try to look inside. What’s the issue and how can I solve this to make it loud?
Do the tips look like this? If so you have the NPP ehxhaust.


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Old May 31, 2022 | 04:24 PM
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Originally Posted by joemessman
Are you sure you hve the NPP exhaust?
like I said im still new to this and ive been reading a lot, I guess mine isnt NPP, but im still confused why do I have all these options in the engine sound management. If I buy this Is it gonna work just fine ? https://www.ebay.com/itm/38491463163...0AAOSwbl5ike9Z

edit: tips dont look like that
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Old May 31, 2022 | 04:28 PM
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My 16 base has the NPP settings in the infotaiment center, but I dont have the NPP exhaust.
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Old May 31, 2022 | 04:29 PM
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Originally Posted by CorvetteMike2004
My 16 base has the NPP settings in the infotaiment center, but I dont have the NPP exhaust.
is there anyway to make it loud just like NPP exhaust? Like cheap way instead of replacing whole exhaust
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Old May 31, 2022 | 04:31 PM
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Without the NPP option if you want some sound you are going to have to spend the money on aftermarket exhaust.
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Old May 31, 2022 | 04:38 PM
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Just start drilling holes in the mufflers until it's the right volume.

It's not yours until you drill some holes in it.

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Old May 31, 2022 | 04:38 PM
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Originally Posted by dvilin
Without the NPP option if you want some sound you are going to have to spend the money on aftermarket exhaust.
is this gonna work or do I need whole exhaust system?
https://www.ebay.com/itm/37404303265...3ABFBM1PGdvaNg
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Old May 31, 2022 | 06:17 PM
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Maybe someone can chime in. Do non-NPP exhaust cars have the options in the infotainment center even if it is only standard exhaust?
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Old May 31, 2022 | 06:21 PM
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Originally Posted by joemessman
Maybe someone can chime in. Do non-NPP exhaust cars have the options in the infotainment center even if it is only standard exhaust?
Yes they do. That fact has proven confounding and frustrating to owners of standard exhaust cars.

Orenomest - congrats on your purchase, and welcome to the Forum! Post some pics of your car!
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Old May 31, 2022 | 06:21 PM
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Originally Posted by joemessman
Maybe someone can chime in. Do non-NPP exhaust cars have the options in the infotainment center even if it is only standard exhaust?
yes
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Old May 31, 2022 | 06:45 PM
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Originally Posted by orenomest
is this gonna work or do I need whole exhaust system?
https://www.ebay.com/itm/37404303265...3ABFBM1PGdvaNg
This will not work.
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Old May 31, 2022 | 08:58 PM
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Originally Posted by orenomest
is this gonna work or do I need whole exhaust system?
https://www.ebay.com/itm/37404303265...3ABFBM1PGdvaNg
That won't work, and also note that it says it only fits Corsa mufflers.
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Old May 31, 2022 | 11:33 PM
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If more noise is what you want, why not simply take it to a good exhaust/muffler shop and have them fab a couple straight pipes to replace the mufflers and be done with it? Just sayin'... And, welcome to the Forum!
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Old May 31, 2022 | 11:39 PM
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The modes are not a "sound" control



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Old Jun 1, 2022 | 02:29 AM
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It sounds like you have a base Stingray that didn't come with NPP Exhaust. There is no easy way to back-fit the NPP exhaust to a non NPP car. You more than likely have the base suspension without Magnetic Ride Control and you more than likely don't have the dry sump oil system.

Bill
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Old Jun 1, 2022 | 06:36 AM
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Look
Look for the RPO code sticker. I think it is located near the battery (back right trunk). On mine, pictured you can see I have NPP. If you have NPP, maybe you have NPP set specifically and not what the overall mode of your car is set to.
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Old Jun 3, 2022 | 12:51 AM
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Originally Posted by orenomest
Exhaust has no valves from the back when I try to look inside. What’s the issue and how can I solve this to make it loud?
Sounds like you don't have the NPP exhaust. The NPP exhaust has flappers on the outer tail pipes that are only about 6" in. When these open, they are just about straight. I believe the tail pipes themselves also differ between NPP and non NPP. The NPP pipes are flared, the non NPP are just straight round.

If you have non NPP, only way to tune the sound is to change exhaust system.
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Old Jun 3, 2022 | 04:33 AM
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^ This. A new car back system will do the trick for you in terms of a better sound from the car.
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