help with npp install
Safety Car
Joined: Nov 2011
Posts: 3,715
Likes: 343
From: Norman OK
You are correct, there is no way to wire in OEM NPP mufflers in a non-NPP Corvette so that it will operate like OEM. Beside the wiring that isnt there you are also missing the BCM programming as well and there is no way to get that modified or changed as GM doesnt support that as a option thru the dealerships.
Drifting
Joined: Dec 2019
Posts: 1,814
Likes: 616
From: Blacksburg Va
But all is not lost. The valves are spring loaded to the full open position. You can jam the valves partially closed and experiment w/ how far you close them. Get a piece of 1/8x1 inch aluminum and bend it like this.
by https://www.flickr.com/photos/152454123@N04/, on Flickr
And install it like this
by https://www.flickr.com/photos/152454123@N04/, on Flickr
The curved piece above the aluminum is the edge of the valve. W/o the jammer it would be down across the center of the pipe. The nice thing is that the edge of the valve has a small bend over. So you hold it partially closed by hand and slip the jammer in underneath it. The bend over keeps the jammer from sliding out from under the valve. Mine have been in for over a year and never slipped. Note this is the right side pipe. the left side pipe is opposite. The jammer goes on the top there. Of course you could always leave the valves full open if you like. I prefer them adjusted some so I can whale on the gas, have a nice tone, but don't pi$$ too many people off or draw attention to myself.
Does anyone know how to avoid the double pictures when using Flickr. I tried using the forum upload process but it makes the pictures huge.
And install it like this
The curved piece above the aluminum is the edge of the valve. W/o the jammer it would be down across the center of the pipe. The nice thing is that the edge of the valve has a small bend over. So you hold it partially closed by hand and slip the jammer in underneath it. The bend over keeps the jammer from sliding out from under the valve. Mine have been in for over a year and never slipped. Note this is the right side pipe. the left side pipe is opposite. The jammer goes on the top there. Of course you could always leave the valves full open if you like. I prefer them adjusted some so I can whale on the gas, have a nice tone, but don't pi$$ too many people off or draw attention to myself.
Does anyone know how to avoid the double pictures when using Flickr. I tried using the forum upload process but it makes the pictures huge.
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
While it will not be as good as FACTORY NPP control at least you will be able to open and close them with this
Dave
https://www.vividracing.com/-p-15130...oaAheFEALw_wcB
Dave
https://www.vividracing.com/-p-15130...oaAheFEALw_wcB
