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6.6 Gas - choosing Flowmaster exhaust

NWSierra
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NWSierra Enthusiast

NWSierra

Posted
Posted (edited)

There are three kits: 

1. Outlaw - Most aggressive https://www.holley.com/products/exhaust/exhaust_systems/flowmaster/flowfx/parts/718111

2. American Thunder - mid aggressive https://www.holley.com/products/exhaust/exhaust_systems/flowmaster/american_thunder/parts/817933

3. FlowFX - least aggressive.  https://www.holley.com/products/exhaust/exhaust_systems/flowmaster/outlaw_series/parts/818112

 

Who has had the FlowFX?  Does it drone bad?  I know, it's all relative, give me some feedback.

 

On Friday afternoons after a couple beers I'm more along the lines of, "F-it.  I'm getting the Outlaw kit".  The 6 other days, I'm thinking FlowFX.  I hate my moments indecision.  

 

 

Edited by NWSierra
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Cheekster96
Cheekster96

I put in a cat-back from MBRP.  LOVE IT!!

BB68
BB68

If you buy Flowmaster keep the stock so in 2 years when it rusts off you can reinstall the factory 

Jettech1
Jettech1

Oh I love loud exhaust too.  But not on my truck...it's amazing when it's just stupid loud on race cars and burblying when idling... but when it comes to everyday towing or driving...it's not all that

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Pryme Senior Enthusiast

Pryme

Posted
Posted
On 3/22/2023 at 12:47 PM, NWSierra said:

There are three kits: 

1. Outlaw - Most aggressive https://www.holley.com/products/exhaust/exhaust_systems/flowmaster/flowfx/parts/718111

2. American Thunder - mid aggressive https://www.holley.com/products/exhaust/exhaust_systems/flowmaster/american_thunder/parts/817933

3. FlowFX - least aggressive.  https://www.holley.com/products/exhaust/exhaust_systems/flowmaster/outlaw_series/parts/818112

 

Who has had the FlowFX?  Does it drone bad?  I know, it's all relative, give me some feedback.

 

On Friday afternoons after a couple beers I'm more along the lines of, "F-it.  I'm getting the Outlaw kit".  The 6 other days, I'm thinking FlowFX.  I hate my moments indecision.  

 

 

Your links are reversed. I listened to them and was like wow the first one seems mild and it’s supposed to be the loudest?

 

I like the outlaw sound. 
 Isn’t the stock exhaust 3.5” why would these neck down to 3”?

  • 1 month later...
Stand By Enthusiast

Stand By

Posted
Posted

Just wondering, the own muffler being so large, if larger pipes would be any benefit without the little glass pack, or if it would still be to restrictive to matter. Honestly, it's the pipes in front of the muffler at the cats, that's looking quite rusty already.

NWSierra Enthusiast

NWSierra

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Posted
On 4/3/2023 at 2:55 PM, Cheekster96 said:

I put in a cat-back from MBRP.  LOVE IT!!

mbrp.jpg

I like the sound of those too. Dual's are probably half for looks, just partial to dual pipes on what I ride. 

Jettech1 Senior Enthusiast

Jettech1

Posted
Posted

I think my perfect exhaust would sound exactly like the factory system but getting rid of that huge muffler.  Does that exist?

  • Like 1
KARNUT Senior Enthusiast

KARNUT

Posted
Posted
8 hours ago, Jettech1 said:

I think my perfect exhaust would sound exactly like the factory system but getting rid of that huge muffler.  Does that exist?

The manufacturers has  done the research as far as noise vs flow. Restrictions cost HP. I’ve seen exhaust test versus exhaust configuration and large single exhaust won. The muffler is large to reduce sound keep flow. 

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Jettech1 Senior Enthusiast

Jettech1

Posted
Posted
12 hours ago, KARNUT said:

The manufacturers has  done the research as far as noise vs flow. Restrictions cost HP. I’ve seen exhaust test versus exhaust configuration and large single exhaust won. The muffler is large to reduce sound keep flow. 

You're right...I had a vision.....lol...it doesn't exist right now.  Maybe someday...

KARNUT Senior Enthusiast

KARNUT

Posted
Posted
10 minutes ago, Jettech1 said:

You're right...I had a vision.....lol...it doesn't exist right now.  Maybe someday...

The avalanche is the only one I haven’t put loud exhaust on. I still may I never say never. It actually has some sound stock. 

  • Like 1
nards444 Senior Enthusiast

nards444

Posted
Posted
On 4/3/2023 at 5:55 PM, Cheekster96 said:

I put in a cat-back from MBRP.  LOVE IT!!

mbrp.jpg

 

just ordered.  Love the MBRP, put it on everything.

 

With that said, I think I see the answer, but you have to cut it to get the old one off?  

Cheekster96 Enthusiast

Cheekster96

Posted
Posted

You can probably get away with not cutting it. But I did and was alot easier to remove it around the rear axle.

About 3000 miles on it, still sounds good and I love it!

BB68 Enthusiast

BB68

Posted
Posted

If you buy Flowmaster keep the stock so in 2 years when it rusts off you can reinstall the factory 

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