I took my exhaust off today to get my tranny out to rebuild it and swap out my clutch and noticed that right below the headers there are a set of cats, then about a foot back theres another set of cats, and then the mufflers....Whats the point in 4 cats? can i take a pair of them off to make it louder?

 

get an off road h-pipe and eliminate them all, then it will sound great!

 

the first cats are precats...they are used to warm up the O2 sensors for more efficiant(if thats how you spell it lol) operation.

+1 on getting an o/r pipe btw.

 

I got emissons here buddy...cant do that, do you need to have the 2nd set tho?

 

you need both if you want to pass.

 

gee, i always thought the incoming voltage on the o2 heater circuit did that...

the car has 4 cats as mandated by the DOT in the 80s for these cars.

 

you can get away with only 2 cats here in cali

 

i have emissions too... just swap the stocker in when u gotta go thru... its worth it lol

 

After that much of a headache too get the damn thing off and its not even half a year old yet i highly doubt ill ever want to deal with exhaust bulls*** again

 

im positive that they are also used to heat up the o2 sensors before the car is fully warmed up.