Just got and installed the adjustable collars for my NPP exhaust from Nakidparts..... Awesome. Thanks Ed.

Steve

 

Thanks they make a big change in the sound


LINK

Since I installed the NPP mufflers on my 05, I find as many others do, they just leave it open 95% of the time, generally because the closed position is dead quite and no fun. I just wished it was just a little louder in the closed (quiet) position. So for the past few months, I have been trying to develop an easy to install, easy to adjust way to control the sound in the closed position. It’s been in testing for a few months and is now ready for sale.

My new NPP/Z06 Mild Adjustable Control Kit is only $24.99 ($17.99 if you purchase it with my Mild2Wild wireless controller = $107.99).

The current Mild2Wild customer can purchase for $19.99.

The kit comes with 2 custom stainless collars and one extended length Allen wrench. Installation is very simple and fool proof. Can be removed anytime.

1. Remove one allen screw and loosen the other all the way
2. Slip the collar over the actuator rod
3. Align the open screw hole
4. Install the other Allen screw using the provided tool
5. Set the position and tighten both screws
6. Loosen the screws to readjust anytime

The results are amazing I set them to be ¼” open,. Closed at idle you can just tell it’s not the stock exhaust as it has a nice enhanced exhaust tone. The real difference is on the road. Now in the closed setting, the exhaust has a mild but noticeable exhaust note.

Just louder than stock, but not the loud open pipe sound of the system in the full open position. When under moderate acceleration, you now hear the exhaust and any burble or popping is greatly reduced.

Setting it to 3/4” open you can even get some additional sound before it opens over 3000-3500 RPM. I believe this coupled with my Mild2Wild wireless controller give you the best of both worlds. And for those that don’t like the open sound below 3000 RPM, this offers the option of some added sound at idle, and above.

This will not damage the NPP/Z06 actuators since they are closed on vacuum, this kit just makes them stop a little earlier.

The first batch of kits are sold out and more are being built order now for delivery in 5-7 days.

ORDER LINK

Member modshack has done work in this field and commend him for his efforts.

 

Hey guys ! I see the product is not up for sale anymore, but it looks quite easily sourced material from any random mechanic/DIY shop. Does anyone have the dimensions need tho for the collars / the dimension of the actuator rod ?

thanks !

 

Hey, I hope I can be some hope. I recently picked up a Grand Sport with NPP and found myself in the same position. I'm down in FL so I went with an aluminum split shaft collar. It's a 5mm if that helps.

Here's what I purchased:
2x of these collars - Ruland MSP-5-A, 5mm Two-Piece Shaft Collar, Aluminum, Clamp Style, 16mm OD, 9mm Width
And this extended hex t-handle -
Minimal cost, free shipping for all in my case. I have taken a few rides this week to test and so far so good and can adjust as necessary depending on how wide open you want it.

 

I would like the open npp position to be louder. Any suggestions? Thanks

 

I mean if you have a 2010/2011 then you only have two cats, if 2012/20213 then your midpipe has the recall additional cats so you could swap out for the Corsa xpipe.
Outside of that you're looking at graduating to Headers.

 

There used to be for motorcycle straight pipes a product called “Snuff or Not”. They were a manually operated valve at the end of the baffleless straight pipes. Essentially a butterfly valve with a medium sized hole in that valve, turn it to the open position and no restriction for the exhaust gases and their sound, turn it to the “closed” position and the butterfly valve closed down the exhaust except for the medium sized hole in the center of that valve/plate.
Drill a hole in your NPP valve/plate, and you will probably get a bit more tone when the NPP is in the quiet position.
Google Snuff or Not, there might be a picture.

 

Thanks to both of you who responded to my post. I wasn't clear. I like the quiet npp position for cruising on the highway, etc. I want the loud mode to be louder. Will the corsa x pipe do that? What will it do to the quiet mode? My car is a 2012. Would appreciate your thoughts.

 

excellent, i was literally looking at the same product this afternoon - 5mm it is !! Thank you !!! And out of curiosity, did you find a sweet spot that allows the closed NPP to be more “alive”, without the horrible droning at ~1500rpm as when NPP is full open?

 

Yes it has fixed that issue and I will be testing additional levels of "open" to push the threshold. Good luck with your installation and stay patient with all of the adjustments since it's right in there. The long hex was almost necessary to keep me sane with all of my adjustments.