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Old 12-04-2018, 12:26 AM   #1
The Alien
 
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Drives: 2017 2SS Covertible
Join Date: Jun 2018
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DIY Stealth Mode for noisy cold start

Hi folks,

Before I get a ban from the Forum I want to say that everything started just as a game with extra parts I had in garage but at the end it worked and pretty well though


I just installed the axleback Borla S-Type. I love them but during the cold start, they are quite heavy and honestly I was feeling bad for all my neighbors and their kids when I was leaving at 5 am for work.

Anyways the stock exhaust too were pretty annoying at cold start.

My ride has the exhaust dual tip non NPP; however I read that also who has the NPP has the same problem since during a cold start, the valves stay open for the first seconds.

so, here is what I have made:

Cold Start with S-Type


Cold Start with the 'boxes of shame'

the Videos are taken from the same distance, I just zoomed a little more on the first one.
As you can hear, these crappy boxes do their job, and I have to say, they are quieter than the stock exhaust I had!

I've put at the end of the post the pictures on what it's inside the boxes.

I know , foam, cardboard and plastic are not really a good idea when we talk about exhaust but I wanted to test first if the idea I had in mind was actually working (I don't trust myself ).

In addition, I'm going to use them only for a cold start, the gases are not so hot to damage something there. I'm just worried about the condensation and the chemicals that may damage the foam in a long term process.

worst case scenario I will build a new couple, 96c the box, $9 pipes and $5 the foam sheets

in case of quad tips, the box layout will change but I guess it will work anyways.

thoughts? Can I still stay in the forum after sharing how crazy I am?
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Last edited by The Alien; 12-04-2018 at 12:46 AM.
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Old 12-07-2018, 03:07 PM   #2
camaroras
 
Drives: 2018 Camaro 1SS 1LE
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Location: Maryland
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Quote:
Originally Posted by The Alien View Post
...



My ride has the exhaust dual tip non NPP; however I read that also who has the NPP has the same problem since during a cold start, the valves stay open for the first seconds.

...

This is true if you use the mode selector and have the valves tied to the modes, but you can select "stealth" mode manually in the infotainment system and it will start with the valves closed
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Old 12-07-2018, 03:23 PM   #3
Tyl3r
 
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Drives: Camaro 2LT
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So this Home depot box filled with foam to a Camaro is like a silencer for a Gun
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Old Yesterday, 05:41 PM   #4
warren3537
 
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Drives: 2017 Red Hot 1SS
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Yeah the last place that I lived I always would get some comments from my neighbor from when I had my 2010 with the Flowmasters on the cold starts, but since I moved to the country I don't worry about that anymore but good idea with the boxes.
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