NPP Exhaust?

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Mar 6, 2018 | 09:22 PM

1cor29

Thread Starter

7th Gear

Joined: Mar 2018

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NPP Exhaust?

Greetings all!
I'm sure this topic has come up before but I am trying to figure out if my Vette has the NPP exhaust or not. I read somewhere that the NPP exhaust would have 4" tips (non NPP would have 3" tips). Mine are 3" tips and I cannot notice a difference in sound when I change the mode from Track to Sport, to Touring, etc, in the engine sound management. I guess if I don't have it, then why would there be an option to change it in the infotainment screen?

Also, I've also read that there is a fuse one can remove that would open the baffles/valves all the way so it'd always sound like NPP exhaust in the Track mode. Is this accurate and if so, would anyone advise removing a fuse?

Mar 6, 2018 | 09:32 PM

laserdude2215

Burning Brakes

Joined: Nov 2016

Posts: 1,192

Likes: 438

From: San Dimas CA

Just go look at the outside two pipes. Do you have actuators on the outside and a butterfly valve inside - that's NPP.

Mar 6, 2018 | 09:34 PM

1cor29

Thread Starter

7th Gear

Joined: Mar 2018

Posts: 7

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Quote:

Originally Posted by laserdude2215

Just go look at the outside two pipes. Do you have actuators on the outside and a butterfly valve inside - that's NPP.

I don't

Mar 7, 2018 | 12:54 PM

Marc DeSatnik

Racer

Joined: Apr 2016

Posts: 496

Likes: 52

I have a set of NPP mufflers i'd like to sell. PM me

Mar 7, 2018 | 01:15 PM

franknbeans

Racer

Joined: May 2017

Posts: 357

Likes: 68

I thought about wiring up the NPP exhaust for controlling electronic exhaust cutouts.

Last edited by franknbeans; Mar 7, 2018 at 01:16 PM.

Mar 8, 2018 | 07:26 PM

Marc DeSatnik

Racer

Joined: Apr 2016

Posts: 496

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i can't get the message to go through. PM me your email and i'll reply

Mar 9, 2018 | 07:27 AM

1cor29

Thread Starter

7th Gear

Joined: Mar 2018

Posts: 7

Likes: 0

Quote:

Originally Posted by Marc DeSatnik

i can't get the message to go through. PM me your email and i'll reply

Sent! Thank you Marc.

Mar 9, 2018 | 09:03 PM

Red Mist Rulz

Race Director

Joined: Sep 2016

Posts: 13,180

Likes: 10,527

You can't just put NPP mufflers on a non NPP car and expect them the car to control the valves. None of the wiring is there.

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Mar 10, 2018 | 08:04 AM

1cor29

Thread Starter

7th Gear

Joined: Mar 2018

Posts: 7

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Quote:

Originally Posted by DSOMrulz

You can't just put NPP mufflers on a non NPP car and expect them the car to control the valves. None of the wiring is there.

Oh I know; there's wiring end that allows the wiring to plug into the valve adjustment.

Mar 10, 2018 | 03:56 PM

#10

KATCHUP

8th Gear

Joined: Oct 2017

Posts: 8

Likes: 0

From: Atlanta GA

Probably super late but here ya go

You can visibly tell the difference in a C7 with NPP versus NON-NPP

Look below

NON NPP (the difference is the spacing in the exhaust tips) notice the gap between the two mufflers?