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Flowmaster American Thunder exhaust?

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Old Aug 18, 2014 | 09:40 AM
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Default Flowmaster American Thunder exhaust?
Has anyone installed a Flowmaster exhaust? Would like to know details of installation and sound.
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Old Aug 18, 2014 | 08:28 PM
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Here's the Flowmaster installation manual:

http://www.flowmastermufflers.com/kitpdf/817668.pdf

This system has the AFM muffler valves but not the NPP muffler valves
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Old Aug 19, 2014 | 11:58 AM
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Bottom line. Apparently no one on the Forum has installed a Flowmaster exhaust.
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Old Aug 19, 2014 | 01:16 PM
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I would think without the NPP valves it would throw a CEL code.
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Old Aug 19, 2014 | 03:49 PM
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Originally Posted by mkr1966
I would think without the NPP valves it would throw a CEL code.
The C7 Flowmaster is a muffler for C7 Corvettes that don't have the NPP option.

NPP is an option on the C7 while AFM is standard.


The C7 Flowmaster muffler is made out of 409 stainless steel. Cat-back mid-pipe not available
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Last edited by B Stead; Aug 19, 2014 at 05:58 PM.
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Old Nov 6, 2014 | 06:57 PM
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Originally Posted by fredmills
Has anyone installed a Flowmaster exhaust? Would like to know details of installation and sound.
Flow master says their system not any louder than stock.
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Old Nov 6, 2014 | 10:27 PM
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Originally Posted by culpeperbob
Flow master says their system not any louder than stock.
It is definitely louder than stock and sounds much better.

I can actually hear my exhaust when driving normally, before the Flowmasters there was no sound with the stock exhaust.

Check out my videos on Youtube

search c7 flowmaster
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Old Nov 7, 2014 | 12:14 AM
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Originally Posted by yell03
It is definitely louder than stock and sounds much better.

I can actually hear my exhaust when driving normally, before the Flowmasters there was no sound with the stock exhaust.

Check out my videos on Youtube

search c7 flowmaster
I would like to hear the flow master system. What is the u tube title of your sound?
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Old Nov 7, 2014 | 12:49 AM
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I run my 2014 non NPP exhaust with NO MUFFLERS and just the new Flowmaster 4" tips specifically made to fit the C7---- It is just barely louder than a NPP car with the valves open---and I saved the $1200 for NPP------There is no drone or vibration-At cruise it is totally un noticeable----Stomp on it and it growls like a beast---
These cars have 4 cats--at they really quite them down a lot--even with no mufflers !!
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Old Nov 7, 2014 | 06:56 AM
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Originally Posted by tblu92
I run my 2014 non NPP exhaust with NO MUFFLERS and just the new Flowmaster 4" tips specifically made to fit the C7---- It is just barely louder than a NPP car with the valves open---and I saved the $1200 for NPP------There is no drone or vibration-At cruise it is totally un noticeable----Stomp on it and it growls like a beast---
These cars have 4 cats--at they really quite them down a lot--even with no mufflers !!
I did the corsa x pipe, and since that wasn't loud enough I did the BB mufflers. It's louder has a good growl but no where near as loud as my old Pantera. So as I understand you have to keep the back valves because it puts up some kind of signal to the computer, but you have no other mufflers on the car? While I was changing the mufflers I did start the car with no mufflers and it sounded pretty good, but I thought just at idle wasn't too bad but if you were going down the street it would be pretty loud with no mufflers and what about the back valves (before the mufflers that I understand must be hooked up).
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Old Nov 7, 2014 | 02:47 PM
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Originally Posted by culpeperbob
I would like to hear the flow master system. What is the u tube title of your sound?
go on youtube

search under c7 flowmaster

look at vids by Howard G
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Old Nov 7, 2014 | 03:22 PM
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Originally Posted by tblu92
I run my 2014 non NPP exhaust with NO MUFFLERS and just the new Flowmaster 4" tips specifically made to fit the C7---- It is just barely louder than a NPP car with the valves open---and I saved the $1200 for NPP------There is no drone or vibration-At cruise it is totally un noticeable----Stomp on it and it growls like a beast---
These cars have 4 cats--at they really quite them down a lot--even with no mufflers !!
Do you have a sound tape? I would love to hear what the car sounds like with no mufflers. Did you run the x pipe also or keep the stock one on?
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Old Nov 7, 2014 | 04:33 PM
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Someone went with Flowmasters here about a month ago and posted up in this section.
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Old Nov 7, 2014 | 04:44 PM
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Originally Posted by mkr1966
I would think without the NPP valves it would throw a CEL code.
No codes thrown. I've installed the x pipe and a whole new set of mufflers
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Old Nov 7, 2014 | 04:48 PM
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what do the AFM valves do?
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Old Nov 9, 2014 | 10:29 AM
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Originally Posted by culpeperbob
what do the AFM valves do?
They are the Active Fuel Management valves that open and close depending on 4 and 8 cylinder driving modes.
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Old Nov 11, 2014 | 04:00 AM
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Originally Posted by Motohead279
They are the Active Fuel Management valves that open and close depending on 4 and 8 cylinder driving modes.
The "back valves" that you speak of are simply butterfly valves that close almost completely ONLY when the DOD system is operating --Other than that they are always set to full open ---In order to delete these butterflies from closing do the delete the DOD in your tune
These valve are a whole different pair of butterflies that the NPP exhaust mod uses---
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