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Exhaust collars for NPP duel mode

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Old 03-24-2013, 12:52 PM   #1
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Default Exhaust collars for NPP dual mode

Who has these installed and how do you like them? I've been thinking of getting a set to add with my M2W.

Last edited by US Icon; 03-24-2013 at 01:19 PM.
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Old 03-24-2013, 12:59 PM   #2
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I have a set, but they are not installed. I like the sound with it wide open, and only close them during early morning cruising through my very quiet neighborhood.
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Old 03-24-2013, 01:03 PM   #3
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I have them installed and are still experimenting some. They're nice as you can determine how much you want the valves to close if you don't want the complete silence.
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Old 03-24-2013, 01:06 PM   #4
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I think I'm one of the few that do have them on, and have for about three years. Excellent is my opinion (don't have M2W). Keeps them open just a bit all the time which means I hear the exhaust the way I like it throughout the rpm range, and when I floor it, it's wide open. Had to adjust them more closed than I thought---too much noise at 1/4 open.
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Old 03-24-2013, 01:19 PM   #5
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AO, this is true. To significantly reduce the sound you need to have it almost closed.
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Old 03-24-2013, 01:36 PM   #6
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Who sells these?
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Old 03-24-2013, 01:43 PM   #7
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Quote:
Originally Posted by Quick Silver Z View Post
Who sells these?
Here is where I purchased mine:

http://www.nakidparts.com/
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Old 03-24-2013, 02:07 PM   #8
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Quote:
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AO, this is true. To significantly reduce the sound you need to have it almost closed.
absolutely correct for my car; almost closed but that works just fine for me!
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Old 03-24-2013, 02:15 PM   #9
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absolutely correct for my car; almost closed but that works just fine for me!
Agree. I have the kit from southern car parts where you can set the rpm's to where the valves will open and close. I really like that and with the collars it gives you even added versatility.
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Old 03-24-2013, 02:36 PM   #10
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I installed the collars to keep it slightly open (about 1/4") all the time.

The sound was perfect for me. Works great, very pleased!

The collars are easily adjustable... you can fine-tune the "quiet" mode... make it exactly as loud as you want!


With the engine off...


With the engine at idle...


Of course, this does NOT affect the NPP's normal operation -- it still fully opens the exhaust above ~3500 rpm.

And with an exhaust controller (M2W, Sunset Orange) you can still remotely fully-open the exhaust whenever you want.

Last edited by CO Lightfoot; 03-24-2013 at 02:42 PM.
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Old 03-24-2013, 02:42 PM   #11
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Grest post CO, and to make it even easier you are given and very long allen wrench to help facilitate the install.
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Old 03-24-2013, 03:34 PM   #12
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Quote:
Originally Posted by FlyerVette View Post
Grest post CO, and to make it even easier you are given and very long allen wrench to help facilitate the install.
I had the collars on my grand sport, and now have them on my 427 Convertible..... the NPP quiet mod is just too quiet for me
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Old 03-24-2013, 07:26 PM   #13
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I'll add mine to the pile. Great addition to the dual mode exhaust. It's just a little too quiet without the collars.
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Old 03-25-2013, 10:30 AM   #14
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Thanks gents! I agree that the exhaust is just too quiet with the valves completely shut. I'm going to install a set of these collars.
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Old 03-25-2013, 10:59 AM   #15
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Quote:
Originally Posted by FlyerVette View Post
Here is where I purchased mine:

http://www.nakidparts.com/
That's where I purchased mine also. I don't think he sells them any more. Maybe you can find something at the hardware store. ???? I love them just the right tone. Wide open is to loud for my old ears
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Old 03-25-2013, 11:06 AM   #16
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Quote:
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That's where I purchased mine also. I don't think he sells them any more. Maybe you can find something at the hardware store. ???? I love them just the right tone. Wide open is to loud for my old ears
Hi Rudy, hope you are well!

Mc Master-Carr "Two-Piece Clamp-On Shaft Collars"?

What is the diameter of the shaft???
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Old 03-25-2013, 12:35 PM   #17
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Quote:
Originally Posted by Quick Silver Z View Post
Hi Rudy, hope you are well!

Mc Master-Carr "Two-Piece Clamp-On Shaft Collars"?

What is the diameter of the shaft???
Car is at my mothers house so I cannt get at the car right now. go out in your garage and measure it.
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Old 03-25-2013, 12:40 PM   #18
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Quote:
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Car is at my mothers house so I cannt get at the car right now. go out in your garage and measure it.
I would if I were retired!

Nice your Mom let's you drive her car though...

Last edited by Quick Silver Z; 03-25-2013 at 02:14 PM.
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Old 03-25-2013, 12:43 PM   #19
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Quote:
Originally Posted by RDKING View Post
That's where I purchased mine also. I don't think he sells them any more. Maybe you can find something at the hardware store. ???? I love them just the right tone. Wide open is to loud for my old ears
I just ckd his website and unless he's just out of them, it's still on his website under mild to wild. Can't list website 'cause he's not a vendor but you know where to go. Plus, I did forget in my post that extra long allen wrench to adjust the screws. Seems flimsy but is thin and high strength!
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Old 03-25-2013, 02:26 PM   #20
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