NPP questions
Safety Car
Joined: Dec 2009
Posts: 4,194
Likes: 305
From: Lake Havasu City Arizona
SoCal Events Coordinator
St. Jude Donor '12
I would not buy a corvette without the NPP exhaust. Non npp mufflers are just too quiet in my opinion and I"m not interested in paying for another exhaust system so NPP is the way to go for me.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,005
Likes: 12,393
From: NE South Carolina
NPP is good enough for me but may install a switch or remote relay on the GS, but sound is not optimum. It's harsher than a well designed muffler with open butterflys and too quite when they are closed.
Last edited by JerryU; Jan 27, 2017 at 04:31 PM.
Instructor
Joined: Oct 2016
Posts: 223
Likes: 27
Fuse 42
My 2016 Coup is 4 months old , pulled fuse 42 and sits in the glove box. Car sounds great I wish it was a little louder. I do not notice any bad sound when In v4.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,005
Likes: 12,393
From: NE South Carolina
Others have reported a drone when cruising with the fuse pulled. If like my C6, the drone depends on the speeds and if in 6th gear when on the interstate. I installed a switch on the console that put the fuse back in the circuit when it occurred.
I always have my sound system playing "Oldies" when driving to drown out the tire and road noise. Perhaps your listening to heavy metal at high volume!
Last edited by JerryU; Jan 28, 2017 at 07:46 AM.
Instructor
Joined: Oct 2016
Posts: 223
Likes: 27
Drone
There are two sets of butterflys, one pair in the exhaust pipes up high before the mufflers. They are still activated to restrict the exhaust in 4 cylinder mode. You have prevented the butterflys in the mufflers from closing.
Others have reported a drone when cruising with the fuse pulled. If like my C6, the drone depends on the speeds and if in 6th gear when on the interstate. I installed a switch on the console that put the fuse back in the circuit when it occurred.
I always have my sound system playing "Oldies" when driving to drown out the tire and road noise. Perhaps your listening to heavy metal at high volume!
Others have reported a drone when cruising with the fuse pulled. If like my C6, the drone depends on the speeds and if in 6th gear when on the interstate. I installed a switch on the console that put the fuse back in the circuit when it occurred.
I always have my sound system playing "Oldies" when driving to drown out the tire and road noise. Perhaps your listening to heavy metal at high volume!
Race Director
Joined: Oct 2011
Posts: 15,056
Likes: 1,613
From: Holly Springs NC
St. Jude Donor '16-'17,'22,'24
Stingray, I don't know how many answering your question purchased a used C7. I did and NPP was a "must have" for me. When I communicated with dealers via text or e-mail, because they were too far for a quick ride to see the car, if the car didn't have NPP, dual mode exhaust the dealers wouldn't answer the question. I found several cars that seemed to be a good deal, but when I asked if they had NPP, I got the "I don't know, it's loaded, why don't you drive out here (250 miles) to see this Vette".
Knowledgeable dealers with a used C7 know this is a VERY popular option. If their car doesn't have it, they don't want to divulge that knowing it's a deal killer.
In your shoes, I insisted on any C7 I looked at having NPP. I have it and enjoy it.
One more comment, If you're not already aware, in 2014, NPP was NOT standard on the Z51. While it's rare to find one without it, non-NPP 2014 Z51s do exist.
Knowledgeable dealers with a used C7 know this is a VERY popular option. If their car doesn't have it, they don't want to divulge that knowing it's a deal killer.
In your shoes, I insisted on any C7 I looked at having NPP. I have it and enjoy it.
One more comment, If you're not already aware, in 2014, NPP was NOT standard on the Z51. While it's rare to find one without it, non-NPP 2014 Z51s do exist.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,005
Likes: 12,393
From: NE South Carolina
In a recent thread some were surprised to see the OEM C7 has an X-pipe. Vettes have had them for some time. However the Borla and Corsa systems eliminate the small secondary CATs! That is what makes the more aggressive sound. Have to watch for state and possible warrenty issues.
OEM left with CATs, Borla center, Corsa double X pipe right.
Last edited by JerryU; Jan 28, 2017 at 04:50 PM.
Team Owner
Joined: Oct 2004
Posts: 25,583
Likes: 16,942
There is a very mild drone w/ the NPP fuse pulled at highway cruising speeds. It's not particularly objectionable like I've experienced on some aftermarket cat-back systems, but it's there.
The Mild-to-Wild device for $60 or so is worth it for the times when I (more accurately my wife) prefer quieter highway cruising. It takes less than 30 minutes to install, and most of that is involved with tidying up and hiding the wires.
The Mild-to-Wild device for $60 or so is worth it for the times when I (more accurately my wife) prefer quieter highway cruising. It takes less than 30 minutes to install, and most of that is involved with tidying up and hiding the wires.
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