2012 Camaro SS exhaust under the PPV

Discussion on fuel delivery & intake/exhaust tech & mods.
Pursuit
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2012 Camaro SS exhaust under the PPV

Post by Pursuit » Sun May 19, 2013 5:14 pm

Been planning this for a month now. Acquired the the 2012 Camaro SS manifolds, cats, intermediate pipes and mufflers with two separate purchases. Installed the manifolds, cats and pipes last weekend. Cut the intermediate pipes just behind the expansion chamber/resonator. This weekend I added a 7" section ahead of the IRS and then fabbed the transition behind the IRS into the factory mufflers. Used a two bolt flange for connection to the muffler. The connection behind the Camaro resonator is a slip fit. My exhaust guy used pre-bent stainless pipe and we sectioned what we needed. He then TIG welded the assembly. A lot of placement, tacking welding and the usual on and off of the car fitment.
The car is still as quiet as it was new. Definite better mid-range feel. (The not-so-scientific calibrated-butt, seat of the pants feel) Did run the car last Friday before the mods. Best 1/8th time was 9.33 at 76.93 mph. Won't have a chance to run the car again for awhile. I will be on vacation later this week.
I will post pics later today.
Maurice Sheil

mhsheil@gmail.com

2011 Caprice Phantom Black 9C3
2012 Impala 9C1
1995 9C1 Caprice
1996 GMC Sierra C1500
1974 SJ Grand Prix 455 well optioned with factory moon roof

Pursuit
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Re: 2012 Camaro SS exhaust under the PPV

Post by Pursuit » Sun May 19, 2013 11:06 pm

OK, here are the pics:
Attachments
Camaro factory exhaust.JPG
Camaro factory exhaust.JPG (30.38 KiB) Viewed 10703 times
Camaro SS exhaust 1.JPG
Camaro SS exhaust 1.JPG (133.39 KiB) Viewed 10703 times
Camaro SS exhaust 2.JPG
Camaro SS exhaust 2.JPG (119.18 KiB) Viewed 10703 times
Camaro SS exhaust 3.JPG
Camaro SS exhaust 3.JPG (107.01 KiB) Viewed 10703 times
Last edited by Pursuit on Mon Mar 02, 2015 3:54 pm, edited 1 time in total.
Maurice Sheil

mhsheil@gmail.com

2011 Caprice Phantom Black 9C3
2012 Impala 9C1
1995 9C1 Caprice
1996 GMC Sierra C1500
1974 SJ Grand Prix 455 well optioned with factory moon roof

Pursuit
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Location: Omaha, NE area

Re: 2012 Camaro SS exhaust under the PPV

Post by Pursuit » Sun May 19, 2013 11:08 pm

And the rest of them:
Attachments
Camaro SS exhaust 4.JPG
Camaro SS exhaust 4.JPG (127.11 KiB) Viewed 10703 times
Camaro SS exhaust 5.JPG
Camaro SS exhaust 5.JPG (134.13 KiB) Viewed 10703 times
Camaro SS exhaust 6.JPG
Camaro SS exhaust 6.JPG (141.06 KiB) Viewed 10703 times
Last edited by Pursuit on Mon Mar 02, 2015 3:57 pm, edited 1 time in total.
Maurice Sheil

mhsheil@gmail.com

2011 Caprice Phantom Black 9C3
2012 Impala 9C1
1995 9C1 Caprice
1996 GMC Sierra C1500
1974 SJ Grand Prix 455 well optioned with factory moon roof

Navy Lifer
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Re: 2012 Camaro SS exhaust under the PPV

Post by Navy Lifer » Mon May 20, 2013 1:25 am

OK, what changes? Is the pipe up to the axle-back flange(s) larger?

Is the total system weight less?

Do you have any pictures of the 2 versions laying on the shop floor to show the difference?

Pursuit
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Re: 2012 Camaro SS exhaust under the PPV

Post by Pursuit » Mon May 20, 2013 3:31 am

The exhaust manifolds appear to be the same, but, I didn't verify. The exhaust pipe is 2 1/2" from the manifolds, through the cats, through the expansion chamber/resonator and into the Camaro mufflers. The Caprice exhaust is 2 1/4" front to back with the I.D. of the flex joint before the muffler being 1 7/8". I am assuming the larger pipes and catalytic converters would help with flow. The expansion chamber/resonator of the Camaro actually isn't baffled, you can see all of the way through it. There are a couple points where there is no division between the left and right exhaust flows.
As far as weight goes, I did not weigh the two. However, I still have the complete Caprice system, I can weigh that in the next couple days. I can also remove the altered Camaro system and weigh that also.
I will let you know!
Maurice Sheil

mhsheil@gmail.com

2011 Caprice Phantom Black 9C3
2012 Impala 9C1
1995 9C1 Caprice
1996 GMC Sierra C1500
1974 SJ Grand Prix 455 well optioned with factory moon roof

Pursuit
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Re: 2012 Camaro SS exhaust under the PPV

Post by Pursuit » Wed May 22, 2013 7:18 pm

Some more pics regarding restrictions. The intermediate pipe drops down to 2" behind the oval resonator. Also, the I.D. in the Flex joint before the muffler is even smaller than I thought. I used a large socket to try to fit inside of the flex joint. The socket wouldn't fit.
Attachments
Mid pipe section.JPG
Mid pipe section.JPG (191.31 KiB) Viewed 10703 times
Mid pipe 2 inch diameter.JPG
Mid pipe 2 inch diameter.JPG (158.89 KiB) Viewed 10703 times
ID of flex joint at muffler.JPG
ID of flex joint at muffler.JPG (128.52 KiB) Viewed 10703 times
OD of socket won't fit inside ID of exhaust.JPG
OD of socket won't fit inside ID of exhaust.JPG (140.67 KiB) Viewed 10703 times
Last edited by Pursuit on Mon Mar 02, 2015 4:01 pm, edited 2 times in total.
Maurice Sheil

mhsheil@gmail.com

2011 Caprice Phantom Black 9C3
2012 Impala 9C1
1995 9C1 Caprice
1996 GMC Sierra C1500
1974 SJ Grand Prix 455 well optioned with factory moon roof

Pursuit
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Re: 2012 Camaro SS exhaust under the PPV

Post by Pursuit » Wed May 22, 2013 7:20 pm

And here is the system laid out on the ground.
Attachments
Passenger side manifold and Cat.JPG
Passenger side manifold and Cat.JPG (190.47 KiB) Viewed 10703 times
Driver's side manifold and Cat.JPG
Driver's side manifold and Cat.JPG (190.43 KiB) Viewed 10703 times
Manifolds, Cats, intermediate pipes.JPG
Manifolds, Cats, intermediate pipes.JPG (146.66 KiB) Viewed 10703 times
Overall system view.JPG
Overall system view.JPG (162.81 KiB) Viewed 10703 times
Last edited by Pursuit on Mon Mar 02, 2015 4:05 pm, edited 1 time in total.
Maurice Sheil

mhsheil@gmail.com

2011 Caprice Phantom Black 9C3
2012 Impala 9C1
1995 9C1 Caprice
1996 GMC Sierra C1500
1974 SJ Grand Prix 455 well optioned with factory moon roof

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elc32955
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Re: 2012 Camaro SS exhaust under the PPV

Post by elc32955 » Thu May 23, 2013 3:56 pm

Nice! Thanks for the detailed pics and measurements....
System Manager and your tourguide for the day. Caprice Alumni, former owner of a 2011 Caprice 9C3 with a Rotofab CAI and front radiator cover, 3.45 LSD Camaro rear diff, Chris Henry performance tune, G8 GT 18" Enkei rims w/Holden lions, custom SLP axle-back muffler set with tips, Holden WM Caprice factory spoiler, Holden SSV leather steering wheel and leather shift knob, Whelen Alpha-12Q airhorn amp. G8 GT rear seat swap, AVS Ventshades.

nick brown
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Re: 2012 Camaro SS exhaust under the PPV

Post by nick brown » Wed Nov 20, 2013 8:59 am

would taking those two resonators off cause any problems?
2011 CHEVY CAPRICE PPV 9C1 (FIRST OWNER)
2008 CHEVY SEDAN LT
1996 IMPALA SS
1964 IMPALA SS 2 DOOR HARD TOP

Pursuit
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Re: 2012 Camaro SS exhaust under the PPV

Post by Pursuit » Wed Nov 20, 2013 11:50 am

Nick,
I don't believe so. The first set of O2 sensors after the manifolds and before the first set of catalytic converters measure AFR. The second set of O2's measure the first set of cat's efficiency. The second set of cats are referred to as "pup" cats. They are still a catalytic converter, and not a resonator. But, there is no sensor behind these pup cats to monitor them. The design of today's catalytic converters tends to "straighten out" the turbulent exhaust gas pulses. The second set of pup cats helps with emissions and the sound of the system due to their design. There are plenty of threads on the G8 forums that discuss this.

Regards,
Maurice
Maurice Sheil

mhsheil@gmail.com

2011 Caprice Phantom Black 9C3
2012 Impala 9C1
1995 9C1 Caprice
1996 GMC Sierra C1500
1974 SJ Grand Prix 455 well optioned with factory moon roof

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