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PostPosted: Wed May 10, 2017 5:25 pm 
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Joined: Sat Feb 07, 2015 8:31 pm
Posts: 1540
Location: Pearland, Texas
So you can use the Camaro SS/ZL1 manifolds, OR the Z28 'tubular' manifolds, correct?

What about the primary cat? Since the Caprice manifold necks down to 1-7/8, or so, what's the inlet on the front cat?

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Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
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PostPosted: Wed May 10, 2017 6:01 pm 
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Joined: Tue Apr 23, 2013 8:39 pm
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Location: Omaha, NE area
Gene,
Yes the cast SS/ZL1 manifolds bolt right up and I've used the SS/Zl1 cats attached to various Camaro cat back systems (adding the extra length past the cats using a cross over and an extra length of pipe). The inlet and outlet of the piping welded to the cats is 2-1/2".
See here : viewtopic.php?f=16&t=1834
The Z28 tubular headers are on as of today, but, I have not seen them yet. My fabricator says that the tightest fit is on the passenger side. I will have more info when I get back home this weekend.

Regards,

Maurice

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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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PostPosted: Wed May 10, 2017 7:40 pm 
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Joined: Sat Feb 14, 2015 2:12 am
Posts: 631
Location: SE PA
the OEM cast iron manifolds are all the same between camaro SS, PPV and G8 GT please don't be fooled into buying "ZL1" manifolds as they are not different only the z28 version is.

http://www.wholesalegmpartsonline.com/p ... 11638.html


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PostPosted: Thu May 11, 2017 8:55 pm 
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Joined: Mon May 30, 2016 8:12 am
Posts: 369
Location: phx az
ZL1 are different , but the same design

the ZL1 are made from a different metal , than the standard cast iron


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PostPosted: Fri May 12, 2017 12:44 pm 
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Joined: Sat Feb 14, 2015 2:12 am
Posts: 631
Location: SE PA
What would be the reasoning behind that? Heat output? and why not make a different design while they were at it? Part #?

Well I looked it up and they did make the ZL-1 only manifolds from a "cast stainless" which was for heat and they also have a relief cut in the flange where it bolts to the head. Not sure there is a performance benefit for anyone that is NA and the cost is approaching full length headers if you are buying them new.


Last edited by xcidmigs on Fri May 12, 2017 3:09 pm, edited 1 time in total.

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PostPosted: Fri May 12, 2017 2:15 pm 
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Joined: Sat Feb 07, 2015 8:31 pm
Posts: 1540
Location: Pearland, Texas
Pursuit wrote:
Gene,
Yes the cast SS/ZL1 manifolds bolt right up and I've used the SS/Zl1 cats attached to various Camaro cat back systems (adding the extra length past the cats using a cross over and an extra length of pipe). The inlet and outlet of the piping welded to the cats is 2-1/2".
See here : http://newcaprice.com/forum/viewtopic.php?f=16&t=1834
The Z28 tubular headers are on as of today, but, I have not seen them yet. My fabricator says that the tightest fit is on the passenger side. I will have more info when I get back home this weekend.

Regards,

Maurice


Maurice,

My question is, what is the inlet ID on the factory Caprice front cat? I have an aftermarket cat back to install on our '12, and am thinking that if I could grab a couple of SS stock manifolds, use our front cats, then bolt up the cat back, I could get a pretty decent exhaust system for not a lot more money than what I already have in the cat back. I'm not wanting to replace the front cats, but use them, IFF they're not another choke point.

Thoughts?

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Gene Beaird,
Pearland, Texas
2012 Caprice 9C1
1992 B4C 1LE Camaro
2010 Tahoe PPV (her car)
1995 DGGM Impala SS
1996 BBB Impala SS (11-second DD)
1985 Firebird - 310 LS1 C Prepared autocross car.
And some others
Do YOU have my SPID?


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PostPosted: Fri May 12, 2017 3:14 pm 
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Joined: Sat Feb 14, 2015 2:12 am
Posts: 631
Location: SE PA
CrashTestDummy wrote:

My question is, what is the inlet ID on the factory Caprice front cat? I have an aftermarket cat back to install on our '12, and am thinking that if I could grab a couple of SS stock manifolds, use our front cats, then bolt up the cat back, I could get a pretty decent exhaust system for not a lot more money than what I already have in the cat back. I'm not wanting to replace the front cats, but use them, IFF they're not another choke point.

Thoughts?


this has been gone over already, the OEM PPV/g8 exhaust manifold is EXACT SAME as the camaro versions, same part # etc. No change needed there. What is different between the 2 platforms is the OEM front cat pipes which are shown here in this thread. PPV/G8 uses a smaller than 2" main cat inlet. Camaro manual trans pipes are the biggest factory offering.
viewtopic.php?f=16&t=121


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PostPosted: Fri May 12, 2017 4:52 pm 
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Joined: Thu Dec 17, 2015 7:30 pm
Posts: 25
Location: Middle Tennessee
I plan on replacing my factory manifolds and front cats with a set of headers this summer. I will keep the exhaust behind the headers the same as posted in the vid in post #1 to compare apples to apples. I will be doing a before and after chassis dyno to get some good data on the factory restriction and I will be happy to post the results.

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PostPosted: Sat May 20, 2017 12:22 pm 
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Joined: Sat Feb 14, 2015 2:12 am
Posts: 631
Location: SE PA
So I finally got this pic to once and for all show the ID of the stock PPV cast iron manifold which is also the same part that is used on a 2010-15 camaro SS or any G8 GT...
Attachment:
20170520_005534.jpg
20170520_005534.jpg [ 1.09 MiB | Viewed 1672 times ]

As we can see this is not the choke point some claim it is, that 2.14 matches up to the ID of a 2 1/4" tube, not sure but I believe that is the size used on a factory LS3 type downpipe as opposed to the odd PPV flextube version that necks down to less than 1 7/8"
Next I'd like to get my hands on a set of JBA or other shorty headers and see how they compare.


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