06-22-2018, 07:19 PM | #1 |
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Drives: 2013 1LE Join Date: Jan 2013
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NPP exhaust quiet down
Hey guys/gals,
I would like to temporarily close the valves in the NPP exhaust system this weekend. I'm running an HPDE and I'll be at a track with lower than usual sound decibel restriction. It's too late for me to order a mild to wild switch (I'll get one next week) and I'm afraid I'll get blacked flagged for the weekend. I currently have ARH long tubes w/high flow cats so it gets pretty loud at WOT. Would disconnecting the vacuum lines to the mufflers close the valves and keep them closed? I'm heading to circuit Mount Tremblant in Canada. Max is 92db on A scale 15 meters from track edge. Watkins Glen which I do often has no sound restriction. Any help is appreciated. Cheers, Abdi |
06-22-2018, 07:34 PM | #2 |
Drives: 2011 2SS/RS Join Date: Feb 2016
Location: Jacksonville FL
Posts: 1,189
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Would disconnecting the vacuum lines to the mufflers close the valves and keep them closed?
Answer: NO. That keeps them open all the time. IF you have NPP and it wasnt part of the car from the factory a M2W switch does nothing for you as you dont have the required pieces for it. I made my own switch using a few parts. Not cost effective imho.
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•2011 Camaro SS 2SS/RS A6
•MRR M017 1le Replica Wheels •Vararam Ram Air Intake •Speed Engineering Longtube Headers w/ Magnaflow HF Cats •Bo White PnP Stage 2 TB •GPI SS2 VVT Cam w Cometic thin gaskets 10.69 compression •Xpipe w/ Res Delete and NPP Exhaust •Tuned By Anonymous Calibrations •Gen5DIY Mylink Conversion W/ Backup Cam •Morel 3 way custom speakers, Infinity 860w Subwoofers in trunk baffle •Helix P6 6ch amp w/ 8ch DSP and P1 Sub amp |
06-22-2018, 07:42 PM | #3 |
Drives: 2013 SW 2LT/RS LFX/AY6 Join Date: Feb 2013
Location: Orlando, FL
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Laguna pipes? Lol
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K&N CAI, 1LE Strut Tower Brace, Elite Engineering Catch Can and Clean Side Separator, Apex Scoop w/ Washer Relocation Kit, CTS Front Calipers and Rotors, JacFab Ported Intake Manifold, JacFab Intake Manifold Spacer, 80mm Overkill Throttle Body, SS Brake Lines, Ideal Garage Master Cylinder, Monster Twin Disc Clutch, NPP Retrofit w/ Magnaflow Resonated X, ARH Catless Downpipes, JRE Built 3.45 Diff, 1LE Axles, 1LE Hubs, Overkill Tuned, BMR Anti Wheel-hop Kit Stage I, ACS TL1 Hood Insert, ZL1 Spoiler
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06-22-2018, 07:46 PM | #4 | |
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Quote:
Sorry, the NPP option was from the factory. I might have try to make my own M2W switch tomorrow morning if I can find the parts. |
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06-22-2018, 08:25 PM | #5 |
Drives: 2015 2ss Join Date: Jun 2009
Location: Carol Stream IL
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if you want the ability to close the mufflers, you'll want the Forza Model E2 Controller. That's what i have, it's a very good product. Forza is also a sponsor here.
http://www.forzacomponenti.com/exhau...troller_e.html
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06-22-2018, 09:08 PM | #6 |
Drives: 2014 1SS/1LE Join Date: Nov 2015
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06-22-2018, 10:52 PM | #7 |
Drives: 2014 1SS/RS, 2018 Silverado CC Join Date: Apr 2014
Location: Oceanside, CA
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I did the same thing as larry, works great and I think I spend $10-$15 dollars for the switch and wire needed.
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06-23-2018, 07:39 AM | #8 |
Drives: 2014 2SS RS, 6 sp man Join Date: Feb 2016
Location: Marlton, NJ
Posts: 461
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Temperately mechanically wire the valves in the closed position.
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06-23-2018, 03:15 PM | #9 |
Drives: 2011 2SS/RS Join Date: Feb 2016
Location: Jacksonville FL
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Since it was from factory the M2W will work. Those that added NPP 2nd hand, can not.
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•2011 Camaro SS 2SS/RS A6
•MRR M017 1le Replica Wheels •Vararam Ram Air Intake •Speed Engineering Longtube Headers w/ Magnaflow HF Cats •Bo White PnP Stage 2 TB •GPI SS2 VVT Cam w Cometic thin gaskets 10.69 compression •Xpipe w/ Res Delete and NPP Exhaust •Tuned By Anonymous Calibrations •Gen5DIY Mylink Conversion W/ Backup Cam •Morel 3 way custom speakers, Infinity 860w Subwoofers in trunk baffle •Helix P6 6ch amp w/ 8ch DSP and P1 Sub amp |
06-23-2018, 06:02 PM | #10 |
Drives: 2014 2SS/RS Join Date: Jan 2018
Location: Washington
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I just finished wiring in a 3 position switch this morning. I definitely recommend it. The longest part of the job is running the wires up front. Works great. I did it because I leave at 4:45am for work and after my header install the noise is too much for my neighbors lol.
Sent from my SM-N950U using Tapatalk
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06-24-2018, 04:17 AM | #11 |
Drives: 2015 SS 1LE Join Date: Sep 2014
Location: Long Island, NY
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The mild to wild controller keeps the muffler open all the time and not closed all the time like you are looking to do
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06-24-2018, 08:59 AM | #12 |
Tri-County Camaro SWFL
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You will need the Forza 3 way controller or hard wire a switch.
Just for reference sake....... stock headers, solo high flow cats and NPP (open/WOT) is around 97-98db. My car measured 97.4db at an autocross event where the DB limit is 101.
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06-24-2018, 05:43 PM | #13 |
Drives: too many to say! Join Date: Nov 2010
Location: S.E. Michigan
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10min fix for my NPP exh on my non NPP car... removed the vacuum valves and bought bolts that thread into the joint that pivots the valve. Washers and nuts on the other end
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06-24-2018, 06:26 PM | #14 |
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Everyone,
Thank you for all the inputs! Looks like I have a couple of different options. I'll let everyone know what I did and how my weekend turned out on Wednesday. I have the wife and kids with me and we are spending a couple of extra days checking the lake, mountain and local attractions. |
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