05-18-2016, 04:55 PM | #1 |
Drives: 2013 ZL1 Join Date: Nov 2013
Location: Tennessee
Posts: 32
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Quietest Cat Back system
I have Kooks 1 7/8 long tubes with catless midpipes with stock catback. It is way too loud for neighbors. I bought two Magnaflow 4" round muffler / resonators that are 14" and 20" long total. My hopes was to use them and quieten it down.
https://www.magnaflow.com/products?partNumber=10416 I was hoping the muffler shop would be able to move the stock H-pipe forward and then weld the two resonators in, but shop said there was not enough room. I thought they would fit!! Oh well... They said they would hang too low. So now I am looking for the quietest catback out there.... Any suggestions... |
05-18-2016, 06:19 PM | #2 |
Drives: 2013 TT ZL1 Join Date: Jun 2013
Location: NorCal
Posts: 849
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Magnaflow 3 inch system.
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05-18-2016, 06:45 PM | #3 |
Drives: 2013 2SS (sold) Join Date: Jan 2016
Location: Seattle, WA
Posts: 602
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I bought one of these (actually just came today) and I'm going to have a shop cut out the stock H-pipe and install this in its place
http://www.phastekperformance.com/Ca...pipe-11386.htm Hopefully there's enough room for it...I didn't do any measuring but a few people here with SS's said they've installed it. I know a lot of V6's with muffler deletes install them as well
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05-18-2016, 06:56 PM | #4 | |
Drives: 2013 ZL1 Join Date: Nov 2013
Location: Tennessee
Posts: 32
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Quote:
I wanted to do that exact mod but shop said it was two wide, and would be too close to fuel lines and being 4" deep, it would hang down and drag. When you install please take pics, if it fits I want it.... Also let me know how much it quietens things down... |
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05-18-2016, 07:10 PM | #5 | |
Drives: 2013 2SS (sold) Join Date: Jan 2016
Location: Seattle, WA
Posts: 602
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Quote:
Guy with an L99 installed them here: http://www.camaro5.com/forums/showthread.php?t=62039 Looks tight but should fit Some V6's with them http://www.camaro5.com/forums/showthread.php?t=241703 http://www.camaro5.com/forums/showth...&highlight=obx
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Last edited by clarkkent; 05-18-2016 at 07:24 PM. |
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05-19-2016, 11:00 AM | #6 |
Drives: 2014 Camaro ZL1 Join Date: Jun 2014
Location: Morgantown, WV
Posts: 63
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05-19-2016, 11:25 AM | #7 |
Drives: 2013 2SS (sold) Join Date: Jan 2016
Location: Seattle, WA
Posts: 602
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I think he's just trying to be considerate of his neighbors
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05-24-2016, 07:11 PM | #8 |
GuitarmageddonZL1
Drives: ‘13 ZL1, ‘17 TT ZL1, ‘17 Silverado Join Date: Feb 2015
Location: Harrisburg, PA
Posts: 432
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It's really not that loud when the NPP exhaust flaps are closed. When they're open, yeah that's a different story. I bought the M2W switch so I could keep it quiet in the neighborhood at night/early morning and to do vlogs. Works great! Of course that depends on your definition of "loud."
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05-25-2016, 01:31 AM | #9 |
Drives: 2013 2SS (sold) Join Date: Jan 2016
Location: Seattle, WA
Posts: 602
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Mild to wild only has two modes, not "stealth mode" per se. So you can't have it closed 100% of the time. At idle up to 1500 or something they are open. So startup and warmup is all open
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05-25-2016, 06:37 AM | #10 |
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I had Solo install two resonators in place of the H pipe. Fits fine and quiets my Z down nicely. I have an exhaust controller that allows me to keep the NPP system closed, especially on cold start up.
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05-25-2016, 08:11 AM | #11 |
Drives: 2013 Triple Black ZL1 / 2006 TB SS Join Date: Feb 2011
Location: MN
Posts: 2,250
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I have the ADM exhaust controller and there are two modes: stock and 100% closed all of the time from idle to WOT. Helps keeps the sound level reasonable for those with LT's.
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05-25-2016, 10:09 AM | #12 |
Drives: 2013 2SS (sold) Join Date: Jan 2016
Location: Seattle, WA
Posts: 602
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Cool. I wired in a 3 way switch so I can have open, closed, and stock. And yeah the closed helps a lot with early morning startups
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05-26-2016, 02:53 AM | #13 |
Snake Eater
Drives: 2012 AGM ZL1 Join Date: Oct 2011
Location: TN
Posts: 2,737
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I let the world know I have a race car... loud on cold crank but keep it down until out on the street. not going to sacrifice my happiness and smile over them sleeping 5 mins longer
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05-26-2016, 07:34 PM | #14 | |
Drives: 2015 ZL1 Join Date: Jan 2015
Location: Oceanside, CA
Posts: 313
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Quote:
Heck, almost every owner in the V6 section runs a variation of that one! Maybe if that exhaust shop doesn't feel comfortable performing the mod you could try a different shop? |
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