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C7 exhaust pipes

 
Old 06-11-2019, 07:53 AM
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James43
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Default C7 exhaust pipes

Hello All,
Does it anybody know why the two inside exhaust pipes are a different color than the two outside exhaust pipes on the C7?
Thanks Jimi


Outside pipes are different colors, why?
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Old 06-11-2019, 07:58 AM
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NashvilleGrandSport
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They're not when they're clean. Exhaust/carbon buildup... just needs a good cleaning. With the adjustable exhaust setup, the outside pipes tend to get dirty quicker.
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Old 06-11-2019, 08:22 AM
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JerryU
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Originally Posted by James43 View Post
Outside pipes are different colors, why?
The reason is it has the ~$1195 NPP option ("makes exhaust noise" and also adds 5 hp!) It's standard on some models.

The outside pipes have butterflies that are shut at certain times to force all exhaust to go through the muffler and exit through the inner pipes. At certain rpm's they open fully, essentially bypassing the muffler. (You can see them if you shine a flashlight in the outer pipes.) Hence the extra noise! When the exhaust goes through the muffler baffels and packing any black carbon if left there!


A view inside one muffler

Last edited by JerryU; 06-11-2019 at 08:39 AM.
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Old 06-11-2019, 05:53 PM
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Hi,
Thanks for info, should I use Chrome cleaner?
whats best way to clean?
Thanks
Jimi
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Old 06-11-2019, 06:11 PM
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fsvoboda
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Originally Posted by James43 View Post
Hi,
Thanks for info, should I use Chrome cleaner?
whats best way to clean?
Thanks
Jimi
Just clean cold.

I use only a paper towel knowing that it'll start getting dirty again right away, and it takes only a moment or two, but some guys use various cleaners and polishes.

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Old 06-11-2019, 06:38 PM
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George_L
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Get a Mother's Power Cone and some metal polish (they are stainless steel) for the first cleaning. After that you can fsvoboda does. I keep an ols microfiber hanging next to the car in the garage and wipe them off after each drive, it only takes several seconds. Here is what I used
Power Cone Power Cone
,
Borla polish Borla polish
. The Borla polish adds some tarnish protection that may make wiping them off later somewhat easier. I have had great results.
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Old 06-11-2019, 06:44 PM
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ShadowGray19
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You could go with a Borla S-Type Axle Back System With Ceramic Flat Black 4.5" tips. Just wipe them off once in a while with 303 Speed Detailer and they always look good. You can get them configured to work with the factory NPP system.


Last edited by ShadowGray19; 06-11-2019 at 06:45 PM.
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Old 06-11-2019, 06:48 PM
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Maxie2U
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Originally Posted by fsvoboda View Post
Just clean cold.

I use only a paper towel knowing that it'll start getting dirty again right away, and it takes only a moment or two, but some guys use various cleaners and polishes.




I too clean when cold and simply use a couple damp paper towels. They still look factory new. Once and a while I use polish.

BTW OP really like the look of the perforated exhaust filler panel which I plan to add too. I plan to paint mine carbon flash metallic, stainless still looks great too and so much better than the mufflers.

Last edited by Maxie2U; 06-11-2019 at 06:49 PM.
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Old 06-11-2019, 07:17 PM
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I just wipe the exhaust tips down after every drive and occasionally will use some Mother’s Mag Polish on them.
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Old 06-11-2019, 07:24 PM
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dvilin
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I just hit them with some detail spray and wipe them down with a towel.
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Old 06-11-2019, 09:49 PM
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Old 06-12-2019, 12:31 AM
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Pretty much any metal polish will work. I used some 30-year-old chrome polish until gone. You can also use copper wool (like steel wool but copper) which will not scratch the tips.
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Old 06-12-2019, 12:38 AM
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Get a tube of Flitz or Semichrome and just wipe a little on when dirty..
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Old 06-12-2019, 03:46 AM
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I use Bead Maker on mine about once a week and there is no carbon deposits sticking to the tips. In fact after a week there still isn't any deposits, but polish with Bead Maker anyway. It must be some kind of miracle polish.
All the other products I used polished and shined quite well, but after driving I would have to wipe the tips.

Last edited by joemessman; 06-12-2019 at 03:47 AM.
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Old 06-12-2019, 07:39 AM
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I use wheel cleaner on mine whenever I wash the car. Cleans them up real nice and shiny and I only need to polish them every few months. If you're not going to use a hose to rinse the wheel cleaner off then you're better off with some of the suggestions above.By the way, the wheel cleaner trick only works if you've already polished them and you wash them weekly when you wash your car/wheels.
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Old 06-12-2019, 03:29 PM
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Originally Posted by Grand Slam View Post
Pretty much any metal polish will work.
Yep I use Bar Keepers Friend, the gel version. That will get them back to factory fresh.

Once you've gotten them looking good then every few weeks I just spray them with Simple Green and wipe off.
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Old 06-12-2019, 06:24 PM
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JerryU
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Originally Posted by dvilin View Post
I just hit them with some detail spray and wipe them down with a towel.
That is what I do now! Started with my 2014 Z51 using "Flitz" I bought in a quart can for my street rod none coated aluminum wheels and all the other stainless (it has zero chrome, by design!)

Now I use the same detail spray I use for the rear and wipe it off quickly while they are warm. Just use a different towel. Looks almost as good!
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Old 06-13-2019, 05:18 AM
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Dear All
thanks for so many great ideas
Jimi
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Old 06-13-2019, 09:43 AM
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I painted mine black with high temp paint...matches the rest of my car as well. This was the only polished piece from the factory anyways on my GS. No more black and silver exhaust for me....
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