If i plan to install headers and a 3 inch y pipe to a 3inch cat into dual 2.5 outlets after the muffler would going with a dual cat setup really offer me much benefit? see i have a 95 k frame and i hear dual cats b4 96 is a pain.


what do you all think?

 

Explain that a little better please?

 

basically my question is ... is a dual cat aftermarket setup really offer that much more horse over a single cat setup.

 

No, the more cats = the worse for performance. 96+ cars that have to pass emissions legally need 2 cats in the factory spots. Most places won't check or just won't care enough to so you can probly get away with 1 or none.

 

ok single cat it is for me...thanks

 

Ok, I might be wrong but if you look on the '95 single cat they had 10 less hp than the 96 dual cat setup not sure but as far as I know the cats help performance

 

more cats in series would make less hp, but 2 cats in parallel would flow better. your cross section area is twice as big. if you have to run cats on your car, a 2 cat setup would be best, and you are OBD 1 so its easiest for you. plus 2 cat setup goes with the setup under the car better. im not sure if youre going LTs or not but 2 cats is better than one.... unless if its one after another. think about it... could you suck more water through one, or 2 straws of the same diameter.

 

2 cats in series is not what I think he was talking about. That would be rediculous.

The dual cat cars had 10 more hp by factory spec, but I highly doubt it was from the cats. After running through two cats, it dumped into the same pipe that the single cats did, so how is there an advantage? I personally think it was just for emissions purposes.

 

Cats don't add horsepower, they are for emissions purposes only, they resrtict the exhaust to change what it can into water vapors and CO2. Theres no need to have two unless you need to by law. If cats added performance why would people take them off or hollow them out?

 

I think this is what you are looking for the dual cat setup allows more airflow because it has the two pipes to flow through not because it has two cats. If there are no emission controls go with no cat if there is get one high flow.

 

i said IF he is going to run cats a 2 cat setup would be better. of course no cats would be best. a cat restrics flow compared to an open pipe, your engine pumps out the same amount of exhaust regardless, so would you want all that exhaust being crammed through one cat, or would you want to load spread out across 2 cats, after the cat(s) its just open pipe and flows much more than where the cats are, unless if you have a restrictive muffler.

think of it as a highway... more lanes more flow.... of course if you have no speed limit (no cats) it would be best, but its illegal

 

2 cats in parallel will outflow a single cat setup, assuming a true dual setup which ensures that the connections remain parallel throughout. However, if those two parallel cats join up to form a single pipe, the advantage is lost.

 

thanks guys i'm goin with single cat setup.

later