NPP modifications
Thread Starter
Pro
Joined: Oct 2015
Posts: 524
Likes: 76
From: El Paso Texas
NPP modifications
Hello Friends,
I have NPP exhaust with a Mild to Wild device. I have been using it with some wire rope clamps on the shafts so the butterflys can't close - they stay open about a quarter inch or so. Nice V8 sound... not annoying. I'm finding that I rarely like having them wide open - too loud. I'm now wanting to let them close all the way when "on" (minivan quiet) and then open slightly to hear the growl when I hit the "off" button.
Does anyone have an idea about what is the best way to let them open slightly, but have an adjustment as well? I thought of some stainless cable around the moving part anchored to the diaphragm bracket. Some barrel clamps with a hex screw would allow for some adjustment. Any experience with this or ideas?
Thanks, Monte
I have NPP exhaust with a Mild to Wild device. I have been using it with some wire rope clamps on the shafts so the butterflys can't close - they stay open about a quarter inch or so. Nice V8 sound... not annoying. I'm finding that I rarely like having them wide open - too loud. I'm now wanting to let them close all the way when "on" (minivan quiet) and then open slightly to hear the growl when I hit the "off" button.
Does anyone have an idea about what is the best way to let them open slightly, but have an adjustment as well? I thought of some stainless cable around the moving part anchored to the diaphragm bracket. Some barrel clamps with a hex screw would allow for some adjustment. Any experience with this or ideas?
Thanks, Monte
Drifting
Joined: Aug 2014
Posts: 1,944
Likes: 339
From: Mesquite, Nv
Drifting
Joined: Aug 2014
Posts: 1,944
Likes: 339
From: Mesquite, Nv
http://www.globalindustrial.com/p/mo...Fc62wAodcKgDoA
Actually, this is a better representation of the split collar. I thought the other one was split, but it's not. But the first link does show it in stainless.
Actually, this is a better representation of the split collar. I thought the other one was split, but it's not. But the first link does show it in stainless.
Thread Starter
Pro
Joined: Oct 2015
Posts: 524
Likes: 76
From: El Paso Texas
High regards, Monte
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Drifting
Joined: Aug 2014
Posts: 1,944
Likes: 339
From: Mesquite, Nv
Yeah, that would probably be easier than the collar. First, the collars are a bear to install unless you have micro fingers. Then you have to get them positioned just right on the shaft in order to limit the opening of the baffle. I actually had mine positioned to limit the amount the baffles closed. Because I didn't get stainless, they actually began rusting to the shaft.
Good luck with your modification, and be sure to follow it up with some pictures.
Good luck with your modification, and be sure to follow it up with some pictures.