Anyone know the history of the pup cats? I thought I read somewhere that they were only put on the 2001-2002 Z06's. I don't remember them being on my 98, so when were they added to the C5 coupes/vert's?

I looked under a 2004 Z06 and they weren't there but were on a 2004 C5

 

They were on my 01 Coupe until I switched to LT headers with Random Tech mid with high flow cats at that time

 

Ok great. This is a good start Anyone else?

 

They were on my 2000 vert i think it has to do with location cali or east coast had them and i think the midwest did not.Did you try a search?

 

I believe they were added in 2000 to the Vettes sold in Calif. & N.E. area. 2001, they went on all Vettes.

 

They were on my '03 Coupe. Now, I have AR headers and the "high-flow" cats.

 

Yep, they were on my 2000-Coupe when I switched over to LT's.

 

I had some on my 2000 FRC when I switched to LT's here in California.

 

In 2000, if you have the pup cats, you have a slightly different cam too...which is designed to offset the ~5hp that they eat up.

207/199 .479/.472 vs 209/198 .500/.500, 117 vs 115.5 LSA

I guess after that they got the 5hp by virtue of the LS6 intake on all C5's.

 

I read also that the 2000 had the biggest cam due to the pup cats.So i hope by going to lt headers and eliminating the pups i get a extra 5hp.Besides the normal gains.already have the ls6 intake

 

good post guys still learning

 

Gotta love the knowledge.

 

 

 

Interesting. I didn't even think of them being put on in certain states vs others.

 

Sweet. Now I need to get an LS6 intake and a tune.

 

2000 was the year that the "pups" were introduced to meet the LEV ( low emissons vehicle) standards in Kalifornia. The closed coupled converters were added up front of the regular single brick CATs on Kalifornia cars. M/Y 2001 brought the pups across- the -board including my LS6.

The under -the- floor CATs were the same from 1997-2001. As a quick fix to pass the stringent CARB ( Kalifornia Air Resources Board) requirements othe GMPT engineers mounted the "pups" CATs upstream to to control the emissions from initial start up to when the under-the-floor CATs lit off.


This never made much scence to me since all the emissions tests that I've ever had done ( in the SF Bay area of Kalifornia) was always done after the engine was up to operating temperature.


"While the offical HP ratings did not change , the '00 California cars were probably 5 hp short of the '97-'99s because of the "pups". The 2001 M/Y had no deficiencys because of the LS1 had other changes that negated the "pups" power loss.


One of the first mods I did to my '01 Z06 was to swap the entire exhaust for an '02 Z06 . Cost was under $350. GMPT Engineer John Juriga says this swap , plus the '02 Z06 fresh air box ( larger initial opening) was worth 10 hp , two inches less of back pressure and 5 1/2 pounds of weight loss. The '02 CATs are the newer double brick design that flow better and don't require the pups to meet the LEV standards .

 

My 2000 convert must NOT have the "pups" as I've not heard any barking coming from under the car!

 

Stock setup on my 2000 FRC:





Kook long tube headers and stock cat adapters after:



Car was imported from Pennsylvania.

 

My 2000 FRC => NO pup cats
My 2001 Coupe => has pup cats