01-22-2019, 03:54 PM | #1 |
Drives: 17 SS 1LE Join Date: Dec 2015
Location: Houston
Posts: 1,920
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Quiet Crossflow Muffler for Custom NPP
I like the stock NPP sound with valves closed but not with valves open (want a deeper tone).
I'd like to make my own NPP system utilizing the OEM valves and running Flowmaster Super 10s to the outer tips. Looking at the OEM suitcase muffler, when the valves are closed it uses a crossflow system to make things quiet. I'm looking to stick a transverse muffler in that space that will operate when valves are closed. How I would route the center muffler: The options I've seen so far are Borla ProXS https://www.borla.com/Borla_ProXS_Mu...Wall_Chart.pdf Flowmaster 80 https://www.flowmastermufflers.com/p...ressive-sound/ Thrush Turbo http://www.thrushexhaust.com/muffler...al-offset.html Walker Quiet Flow https://www.summitracing.com/parts/wlk-22395/overview/ Anyone know of others? |
01-22-2019, 06:14 PM | #2 |
Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,200
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I completely agree with you, the NPP in stealth mode sounds pretty good, besides the rattle, but that's another issue. What do you mean by crossflow? The two exhaust sides go into one chamber?
When the NPP opens at WOT it sounds like a obnoxious straight piped truck with way too much rasp, and is way to loud in my opinion to keep away the attention of do gooders. |
01-22-2019, 09:16 PM | #3 | |
Drives: 17 SS 1LE Join Date: Dec 2015
Location: Houston
Posts: 1,920
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Quote:
A crossflow muffler is mounted transversely. The direction of exhaust flow is as below. |
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01-23-2019, 09:10 AM | #4 |
@Blackmamba_1LE
Drives: 2017 1LE Join Date: Jun 2017
Location: South Florida
Posts: 740
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Below is the hookers exhaust, which is what i have currently on my car... The deep tone was there until i removed my high flow cats from my kooks headers.... no matter what you do no cats = rasp on these cars, i hate it but yes. I think it has to do because these cars are X-pipped i/o H-pipe.
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01-23-2019, 09:55 AM | #5 |
Drives: 2016 2SS Convertible Join Date: May 2012
Location: St. Louis, MO
Posts: 1,710
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Hooker has some similar options:
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01-23-2019, 10:50 AM | #6 |
Drives: 17 SS 1LE Join Date: Dec 2015
Location: Houston
Posts: 1,920
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^^The Hooker isn't deep enough to me. I want to do a custom setup, Flowmaster 10s or Thrush Rattler with valves open & the transverse muffler valves closed.
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01-23-2019, 02:45 PM | #7 |
Drives: 2018 Camaro 1SS Join Date: Jun 2018
Location: DFW
Posts: 422
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What inlet/outlet size are you going for?
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01-23-2019, 03:33 PM | #8 |
Drives: 2002 z28, 2018 2ss 1LE Join Date: Sep 2012
Location: Parrish, Florida
Posts: 834
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That’s a good idea , is it possible to get the valves closer to the y where the pipes split?
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01-23-2019, 07:12 PM | #9 | |
Drives: 17 SS 1LE Join Date: Dec 2015
Location: Houston
Posts: 1,920
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Whatever fits closest to stock piping. Although if it comes down to it, a half inch difference here and there isn't a big deal.
Quote:
You can see here someone routed new mufflers to the stock tips w/ NPP valves. |
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