C7 Tech/Performance Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

2017 Exhaust Upgrade

Thread Tools
 
Search this Thread
 
Old Oct 4, 2023 | 07:29 PM
  #1  
TJP123's Avatar
TJP123
Thread Starter
4th Gear
 
Joined: Jun 2021
Posts: 4
Likes: 0
From: Canada
Default 2017 Exhaust Upgrade

I have an unmodified 2014 Stingray (non-Z51, but WITH GM performance exhaust) ive owned since new and I've removed the NPP fuse for a little more sound, I find the stock sound at high-rpms is excellent so I dont really want to change much there, but find things a little too muted low down in rev range / easy cruising. Ive made the fatal error of getting behind the wheel of a few Italians in the past year (488, Roma, and Granturismo) and particularly love how those exhausts in sport / track come alive and produce those nice low bellowing notes without much effort on the pedal at all (the kind of baratone that echos nicely back off a concrete wall but isnt onoxious). Was wondering if anyone has replicated that on a Vette? Those cars have obvious valve systems as well, as in comfort modes they stay totally muted down. In theory the vette with the NPP fuse pulled should be totally open(?). Could it be the secondary cats on the X pipe?
Reply
Old Oct 4, 2023 | 09:06 PM
  #2  
Pktrusty's Avatar
Pktrusty
Pro
Photogenic
Liked
Loved
Community Favorite
 
Joined: Apr 2022
Posts: 699
Likes: 132
From: Phoenix
Default

Does pulling the npp fuse make it equivalent to track mode? I would assume pulling the fuse would keep them closed?

I never had a different system before I did the work but I would go with the Borla Atak. Heard one on a stock car and sounded good. Being the right loudness is something subjective and might be tough to dial in. You could post in your region and see if anyone has a car with exhaust in your area before you pull the trigger.
Reply
Old Oct 5, 2023 | 09:23 AM
  #3  
CPB's Avatar
CPB
Burning Brakes
All Eyes On Me
Loved
Community Favorite
Top Answer: 1
 
Joined: Jan 2019
Posts: 954
Likes: 376
From: Louisiana
Default

Originally Posted by Pktrusty
Does pulling the npp fuse make it equivalent to track mode? I would assume pulling the fuse would keep them closed?

I never had a different system before I did the work but I would go with the Borla Atak. Heard one on a stock car and sounded good. Being the right loudness is something subjective and might be tough to dial in. You could post in your region and see if anyone has a car with exhaust in your area before you pull the trigger.
Track isn't always open, but pretty close to it. Pulling the fuse permanently opens the valves, which is how the mild2wild system works. It breaks that circuit using a remote fob.
Reply
Old Oct 8, 2023 | 09:51 AM
  #4  
ErnieN85's Avatar
ErnieN85
Safety Car
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2002
Posts: 3,726
Likes: 368
From: Montoursville Pa
Default

Could it be the secondary cats on the X pipe?
Bingo!
Headers & High flow cats with a xpipe and no secondary cats will really do it
Reply
Old Oct 8, 2023 | 07:49 PM
  #5  
C5FORFUN2's Avatar
C5FORFUN2
Drifting
15 Year Member
Liked
Community Favorite
Top Answer: 3
 
Joined: Jul 2006
Posts: 1,490
Likes: 255
From: Lake Tapps WA.
Default secondary cats?

Originally Posted by ErnieN85
Could it be the secondary cats on the X pipe?
Bingo!
Headers & High flow cats with a xpipe and no secondary cats will really do it
I assumed they are actually resonators since there are no O2 sensors back there. Not an expert though.
Reply
Old Oct 11, 2023 | 01:25 PM
  #6  
tlrskunk's Avatar
tlrskunk
Racer
All Eyes On Me
Top Answer: 1
 
Joined: Mar 2017
Posts: 297
Likes: 67
From: Coweta, OK
Default

Originally Posted by C5FORFUN2
I assumed they are actually resonators since there are no O2 sensors back there. Not an expert though.
They are secondary Cats. Not resonators. they are just unmonitored.

The Speed Engineering X-Pipe that deletes the Secondary Cats made a decent sound increase for me. and I'm super happy with how it sounds and fit.
Reply

Get notified of new replies

To 2017 Exhaust Upgrade





All times are GMT -4. The time now is 11:29 AM.

story-0
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-1
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-2
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-3
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE