I heard somewhere that our cars have high flow cats from the factory. Dont know if it is true or not.

 

what kind of car was it?

 

I dont think we have high flow cats in our cars but the stockmanifolds (header shape)flow very well from the factory for shorties. I too agree with hammeron that the CATS flow well though from the factory. I know that after installing high flow cats andmid length headers that one car (see link ) only gained about 10-15 RWHP. http://www.alternativeauto.com/water...texhaustupdateHope it helps J

 

i was gonna attempt to explain what they look like inside, but this should do:

http://images.google.com/imgres?imgu...D10%26hl%3Den\

http://images.google.com/imgres?imgu...3D10%26hl%3Den

looks pretty restrictive to me, plus ours also has these mesh rings, two different ones on each cat