Camaro cat restriction.

Discussion on fuel delivery & intake/exhaust tech & mods.
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Camaro cat restriction.

Post by frbtofdth » Wed Jun 02, 2021 7:31 pm

I just bought an 11 Camaro exhaust to use on my 15 PPV and was surprised to see the cat restriction compared to the Caprice. The Camaro has what looks like an insert that necks the pipe down to about 1.75" whereas the Caprice cat inlet measured at about 2.4". The Camaro was an L99 car though, perhaps the LS3 cats are different, I just though it weird to see that. I'll be using it though, until I get some longtubes and HFC.
PPV cat
20210602_135720.jpg (181.82 KiB) Viewed 220 times
Camaro cat
20210602_135709.jpg (67.38 KiB) Viewed 220 times

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Re: Camaro cat restriction.

Post by Pursuit » Wed Jun 02, 2021 9:45 pm

From a post, way back, for size references... Also, look at the outlet size of the exhaust manifolds. 2" at the most. Even on the LS7 Camaro factory tubular tri-y header, 2". ZL1 2"... ... 99+exhaust

Maurice Sheil

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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