Cat-, Axle- Back Exhaust question.

Mister Will · 06-29-2018, 10:14 AM

Hi All,

First, please forgive my ignorance.

Typically in the past with pony cars or corvettes, a "catback" was a no brainer as a first or early mod. Generally they were a simple bolt on. Unbolt the OEM pipes and mufflers and bolt in the aftermarket product.

However, with the exhaust system of the C6 Camaro SS I hear a lot of talk of cutting pipes and welding. I looked under the car and I don't see any flanges between the cats and the mufflers. Do you have to cut the pipes if keeping the cats (primary and secondary) in place are a must? Are the days of the catback being a "bolt on" inapplicable?

enzia35 · 06-29-2018, 10:17 AM

Cutting and clamps.

srcstc · 06-29-2018, 01:01 PM

I believe a full cat back is bolt on if you lose the secondary cats.

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17txcamaross · 06-29-2018, 01:14 PM

Catback is still 100% bolt on if you are retaining all cats. Well, clamp/bolton.

Mister Will · 07-01-2018, 10:09 AM

So basically if you want to retain all of the cats, you will have to cut some pipes, correct?

JamesNoBrakes · 07-01-2018, 10:32 AM

Quote:

Originally Posted by Mister Will

So basically if you want to retain all of the cats, you will have to cut some pipes, correct?

Why are you doing an axle-back exhaust in the first place? It adds no power at all. It can make the exhaust louder, but some of that has to do with what is happening upstream of the axles as well. It makes a lot more sense to save up a bit more money and change out more of the system.

enzia35 · 07-01-2018, 10:42 AM

Some people just want a better sound.

Chef-j · 07-02-2018, 09:50 AM

I see clamps after secondary cat.

https://www.mishimoto.com/engineerin...system-review/

Mister Will · 07-02-2018, 10:39 AM

Quote:

Originally Posted by JamesNoBrakes

Why are you doing an axle-back exhaust in the first place? It adds no power at all. It can make the exhaust louder, but some of that has to do with what is happening upstream of the axles as well. It makes a lot more sense to save up a bit more money and change out more of the system.

This is the primary reason for the question. If there is no power gain, then the only point of changing the exhaust is to change the exhaust tone. I can't replace any components before or including the cats without affecting smog compliance (I don't want to go that route anymore).

In all of my previous cat-backs from a '88 Fox Body Mustang, '98 Camaro Z28, to a '04 Corvette Coupe, all of the bolted on to an existing flange of the OEM exhaust. I would be willing to do and cat-back that was a simple bolt in bolt out.

While I would like to change the exhaust sound to be more muscle car like, I don't want to cut up the stock pipes to do this. I see no real advantage to changing the muffler. So I will probably just keep it stock.

Chef-j · 07-02-2018, 11:47 AM

Quote:

Originally Posted by Mister Will

I see no real advantage to changing the muffler. So I will probably just keep it stock.

Weight saving

Mister Will · 07-02-2018, 01:21 PM

Quote:

Originally Posted by Chef-j

Weight saving

I don't think we are talking about enough to be significant.

SilverBlueSS · 07-03-2018, 10:54 AM

Quote:

Originally Posted by Chef-j

Weight saving

Or not

My factory axel back non-NPP weighed 29.4 lbs. The Borla S 27 lbs...
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srcstc · 07-03-2018, 12:04 PM

Quote:

Originally Posted by Chef-j

I see clamps after secondary cat.

https://www.mishimoto.com/engineerin...system-review/

There's no clamps after the secondary cats.

Sent from my iPhone using Tapatalk

VinnAY · 07-03-2018, 01:18 PM

Quote:

Originally Posted by enzia35

Some people just want a better sound.

"Track" setting is too tame.

06-29-2018, 10:14 AM	#1
Mister Will Drives: 2021 Camaro ZL1 A10 Join Date: May 2013 Location: San Diego, CA. Posts: 457	Cat-, Axle- Back Exhaust question. Hi All, First, please forgive my ignorance. Typically in the past with pony cars or corvettes, a "catback" was a no brainer as a first or early mod. Generally they were a simple bolt on. Unbolt the OEM pipes and mufflers and bolt in the aftermarket product. However, with the exhaust system of the C6 Camaro SS I hear a lot of talk of cutting pipes and welding. I looked under the car and I don't see any flanges between the cats and the mufflers. Do you have to cut the pipes if keeping the cats (primary and secondary) in place are a must? Are the days of the catback being a "bolt on" inapplicable?

06-29-2018, 10:17 AM	#2
enzia35 Drives: '16 Garnet Red 1SS Join Date: Mar 2014 Location: College Station, TX Posts: 3,450	Cutting and clamps. __________________ '16 Camaro 1SS '18 Miata GT Gone: '01 Camaro, '14 Camaro, '90 Miata

07-01-2018, 10:42 AM	#7
enzia35 Drives: '16 Garnet Red 1SS Join Date: Mar 2014 Location: College Station, TX Posts: 3,450	Some people just want a better sound. __________________ '16 Camaro 1SS '18 Miata GT Gone: '01 Camaro, '14 Camaro, '90 Miata

06-29-2018, 01:01 PM	#3
srcstc Drives: 2016 Camaro 2SS Join Date: Nov 2016 Location: North Jersey Posts: 591	I believe a full cat back is bolt on if you lose the secondary cats. Sent from my iPhone using Tapatalk

06-29-2018, 01:14 PM	#4
17txcamaross Drives: 2017 Camaro 2SS Join Date: Dec 2016 Location: Houston Posts: 469	Catback is still 100% bolt on if you are retaining all cats. Well, clamp/bolton.

07-01-2018, 10:09 AM	#5
Mister Will Drives: 2021 Camaro ZL1 A10 Join Date: May 2013 Location: San Diego, CA. Posts: 457	So basically if you want to retain all of the cats, you will have to cut some pipes, correct?

07-02-2018, 09:50 AM	#8
Chef-j Drives: 2018 Camaro 1SS Join Date: Jun 2018 Location: DFW Posts: 422	I see clamps after secondary cat. https://www.mishimoto.com/engineerin...system-review/

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