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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 08-06-2011, 11:16 PM   #1
Witchdoctor92
 
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Exhaust, Cat-back vs Axle-back?

Where is the advantage to the cat-back system? Seems like the Axle back is a 90% solution. Everything up to that is a strait pipe unless you are replacing cats and headers too(I am not) Also does anyone know what size the stock system is? I am trying to marrow my choices down.
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Old 08-06-2011, 11:20 PM   #2
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Auto or manual? It matters.

The stock system is 2.5" on both

The stock system is really free flowing so you arent going to pick up many of any HP/TQ with a cat back over an axel back.

The main advantage of the cat back is three-fold really.

1. most are 3"
2. you get an X pipe instead of an H pipe (OEM)
3. you get rid of the resonators.

Now, if its an auto and you get rid of the huge can resonator... when the AFM kicks in and it goes to 4 cyliner mode, a lot of people say it sounds bad. I have never heard it so I dont know.

If all you want is a little more sound, the axel back will do...
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Old 08-06-2011, 11:22 PM   #3
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Go to the Exhaust & Bolt On section in the Technical section and you'll see lots of information on the pro's and con's of axle back versus cat back...and more.
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Old 08-06-2011, 11:24 PM   #4
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Originally Posted by Sunlover View Post
Go to the Exhaust & Bolt On section in the Technical section and you'll see lots of information on the pro's and con's of axle back versus cat back...and more.
ya... or this.
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Old 08-06-2011, 11:31 PM   #5
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Axle-back for sound and savings... only drawback, be it a small one, you'll have to cut your OE exhaust.

Like jrhaus76 stated above, some Cat-backs are larger diameter and give you an x-pipe... more of a bolt on set-up for almost twice the price of an Axel-back

I went with a Corsa Cat-back...

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Old 08-06-2011, 11:38 PM   #6
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That was a cool video! I like how you stayed in it and got a little sideways! Sounds really good!

I have a video of my FlowMaster but it wont really do much good becasue its with the LT headers which the OP said he isnt doing.
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Old 08-06-2011, 11:44 PM   #7
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Originally Posted by jrhaus76 View Post
That was a cool video! I like how you stayed in it and got a little sideways! Sounds really good!

I have a video of my FlowMaster but it wont really do much good becasue its with the LT headers which the OP said he isnt doing.
Thanks, was trying avoid leaving burnout marks where I work
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Old 08-06-2011, 11:49 PM   #8
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Thanks for the info. Headers will happen, but probably a year or two down the road. I am looking at either Flowmaster AT or possibly Cherry Bomb. Sounds like a Cat-Back is the way to go.
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Old 08-06-2011, 11:57 PM   #9
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Quote:
Originally Posted by Kahdir View Post
Axle-back for sound and savings... only drawback, be it a small one, you'll have to cut your OE exhaust.

Like jrhaus76 stated above, some Cat-backs are larger diameter and give you an x-pipe... more of a bolt on set-up for almost twice the price of an Axel-back

I went with a Corsa Cat-back...

Holy hell, that sounds good I've got the Corsa on my 6, and obviously, it's not quite the same, but it has a nice sound. They make a nice system
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Old 08-07-2011, 12:16 AM   #10
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Quote:
Originally Posted by Witchdoctor92 View Post
Thanks for the info. Headers will happen, but probably a year or two down the road. I am looking at either Flowmaster AT or possibly Cherry Bomb. Sounds like a Cat-Back is the way to go.
Here is FlowMaster AT with the cutouts closed then open... its a crappy iphone video though.



Here is a dyno video:



and a walk aboud of both cars with FlowMaster :



All videos are with 1-7/8 LT headers and FlowMaster AT cat back.
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Old 08-07-2011, 01:25 AM   #11
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Quote:
Originally Posted by jrhaus76 View Post
Here is FlowMaster AT with the cutouts closed then open... its a crappy iphone video though.



Here is a dyno video:



and a walk aboud of both cars with FlowMaster :



All videos are with 1-7/8 LT headers and FlowMaster AT cat back.
That is a great sounding combo
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Old 08-07-2011, 09:18 AM   #12
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An axle-back or muffler delete can never be as loud as a full cat-back system. I've got the Solo Performance Axle-back (a muffler delete with j-pipes) and it is by no means obnoxiously loud. I can leave at 1am without feeling like i'm gonna wake up the neighbors. It's also drone free!

I heard jrhaus's car in person and it's much louder than mine.

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Old 08-07-2011, 04:13 PM   #13
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Quote:
Originally Posted by Kahdir View Post
Axle-back for sound and savings... only drawback, be it a small one, you'll have to cut your OE exhaust.

Like jrhaus76 stated above, some Cat-backs are larger diameter and give you an x-pipe... more of a bolt on set-up for almost twice the price of an Axel-back

I went with a Corsa Cat-back...

Ahem, cost please? My SS is on order and I'm hoping to have exhaust ready and waiting for it when it comes home.
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Old 08-07-2011, 04:20 PM   #14
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Originally Posted by SS_Matt View Post
Ahem, cost please? My SS is on order and I'm hoping to have exhaust ready and waiting for it when it comes home.
I bought mine direct from Corsa (I work for an aftermarket part distributor), but I'm sure there are vendors on here that can get you a great price
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Old 08-09-2011, 03:54 PM   #15
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Originally Posted by Witchdoctor92 View Post
Where is the advantage to the cat-back system? Seems like the Axle back is a 90% solution. Everything up to that is a strait pipe unless you are replacing cats and headers too(I am not) Also does anyone know what size the stock system is? I am trying to marrow my choices down.


Witchdoctor92 – There’s a lot more than better sound when upgrading your exhaust.

To give a quick summary of Axle-Back vs Cat-Back, we’ll answer your questions in regards to a stock Camaro exhaust and the installing Flowmaster exhaust systems.

The stock system is a 2.5” diameter and our Axle-Back kits for the SS Camaros have a flared adapter to expand the 2.5” to the 3” pipe. Flowmaster Cat-Back systems are 3” pipe from the exit of the catalytic converters to the rear of the tail pipes. The Cat-Back also removes the resonators in front of the rear axle and swaps out the factory H-Pipe to our Scavenger X-Pipe.



All of our Cat-Back and Axle-Back systems increase power over factory equipment. We won’t release a system from R&D to production if we can’t prove on a dyno that it increases horsepower and torque over stock exhaust on a factory equipped vehicle. This goes for systems for every car. In some cases the gains are a few HP and in some applications it’s more than 20HP.
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