[JCunningham]

Originally Posted by chozn4service

My axle sounds much better than OEM as it’s more deeper and robust but not obnoxious


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i agree

[JCunningham]

Originally Posted by Pollock

How many decibels does the flowmaster make on a stock car. Dont want to get kicked off the race track. 105 is the limit.

I have a ZL1

keep it in stealth and it will be fine. 105db on a race track. guess only street cars allowed on that track. how do they determine 105? you'll be going around the track at high RPM. I wonder what the stock NPP is at 6000rpm

[njweatherman]

I have the 817746 Flowmaster set-up on my 2018 2ss with the fuse pulled and the K&N Blackhawk cold air intake. It's very loud on start-up because the Tach starts at 1200 rpms or so to warm-up, but once the Tach drops to 500 - 600 (idle when warm), it does not sound that loud.
As for WOT, it's hard to tell because the exhaust is in the back.
I'd call Flowmaster. I'm sure the engineers have that decibel number.

[KingLT1]

Just a heads up...Amazon has a couple of these left for 998.00. I just signed up for a prime rewards card and got 70.00 off. So 928.00 shipped.

[Mighty Mouce]

Originally Posted by FlowmasterMufflers

Flowmaster American Thunder Dual Mode Axle-back Exhaust System (NPP) for the 2016-2018 Camaro SS and ZL1 w/6.2L V8 - Part #817746





Application:
Fits 2016-2018 Camaro SS & 2016-2018 Camaro ZL1 with 6.2L Engine. Fits WITH Performance Exhaust Option (NPP-Quad Tip)

Features:
Flowmaster's Axle-back system for the 2016-2018 Camaro SS & 2016-2018 Camaro ZL1 with the 6.2L V8 engine is perfect for the person looking for a powerful and aggressive sound quality in Track mode, while maintaining a mellow tone during Stealth mode. This kit features tandem Delta 40 and Outlaw® mufflers and 4.00 inch polished stainless steel tips. Includes functional exhaust valves to work with the OE actuator motors to select between sound levels. The exhaust system is manufactured in the USA with 409S stainless steel and is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit on both coupe top and convertible models with the factory NPP option (Identified by quad tips). The system includes all necessary parts and hardware for installation.

Note:
The system is a clamp-on, however, OE system will require cutting to remove factory mufflers.

-Stainless Steel Construction
-Dyno Tuned For Maximum Performance
-Dual Mode Operation
-Made in the USA

Please call 707-544-4761 or visit www.flowmastermufflers.com for additional application and product information.

Still to raspy. I'll keep mine stock.

[chozn4service]

Love mine and even deeper with the Scavenger X Pipe


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[Jfmoore79]

Does anyone have a sound clip of this system on a car with all cats removed? I realize that no cats typically equals a raspy sound but I was hoping to find an axle back that would deepen the tone.

[KingLT1]

Originally Posted by Jfmoore79

Does anyone have a sound clip of this system on a car with all cats removed? I realize that no cats typically equals a raspy sound but I was hoping to find an axle back that would deepen the tone.

Just installed mine today. I have the CA performance cat delete's but still retain the secondary's.

[Jfmoore79]

Thanks King! That was exactly what I needed to hear. This may be the direction I go.

[MAGAUSA]

I ordered this axle back a few days ago and I already have the Borla mid pipe without the factory resonators as I prefer to call them. I can't wait to hear how this sounds. I need a more aggressive sound with the ability to tone it down on cold starts so I don't sound like a total idiot to my wife, in-laws, and neighbors.

[70chevelleSS]

Originally Posted by MAGAUSA

I ordered this axle back a few days ago and I already have the Borla mid pipe without the factory resonators as I prefer to call them. I can't wait to hear how this sounds. I need a more aggressive sound with the ability to tone it down on cold starts so I don't sound like a total idiot to my wife, in-laws, and neighbors.

Curious how the fit on this will be. I have the american thunder NPP on my SS and have thought about putting the Borla x pipe with secondary cat deletes.

I love the sound of exhaust although it drones pretty significantly with the valves open. Valves closed there is almost no drone though. Very deep and aggressive sound much better than stock NPP.

[Camaro 79]

Originally Posted by 70chevelleSS

Curious how the fit on this will be. I have the american thunder NPP on my SS and have thought about putting the Borla x pipe with secondary cat deletes.

I love the sound of exhaust although it drones pretty significantly with the valves open. Valves closed there is almost no drone though. Very deep and aggressive sound much better than stock NPP.

When you say Valves closed, do you mean when the exhaust is in Stealth mode? Or when the car is in Touring/Sport/Track below a certain RPM range?

[MAGAUSA]

Originally Posted by 70chevelleSS

Curious how the fit on this will be. I have the american thunder NPP on my SS and have thought about putting the Borla x pipe with secondary cat deletes.

I love the sound of exhaust although it drones pretty significantly with the valves open. Valves closed there is almost no drone though. Very deep and aggressive sound much better than stock NPP.

Do you have a manual or auto? If the sound isn’t to my liking I may through on the borla resonators. The borla lines right up to stock so I’m not expecting figment issues

[fredz]

waiting for my FM to show. Got the Scavenger pipes and now need the mufflers. Once I get them installed I will be happy to post the information. I know we all like to hear them so I will get a sound bite for you.
I have the 2018 zl11le Black Widow! Just hope we don't have to wait long.
fredz