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Two catalytic converters???

aovsi

Supporting Member
1,948
8
Sep 30, 2002
Chicago, Illinois
Has anyone ever installed two catalytic converters, two high-flow 3", one right after the other? Anyone thought of this? What do you think? Do you think I'm retarded? :laugh:
 

stuffy1256

Proven Member
534
0
Nov 15, 2002
Odessa, Texas
well lets think logically, a which would be better, a regular 3" piping or a slightly constrictive cat, hmmm con constriction vs constriction, i think you can figure it out :thumb:


ps if im completly wrong im an idiot i know, if im right then forget what i just said :shhh:
 

aovsi

Supporting Member
1,948
8
Sep 30, 2002
Chicago, Illinois
Originally posted by stuffy1256
well lets think logically, a which would be better, a regular 3" piping or a slightly constrictive cat, hmmm con constriction vs constriction, i think you can figure it out :thumb:


ps if im completly wrong im an idiot i know, if im right then forget what i just said :shhh:

Um, the car needs to be emissions-legal, Einstein. WRX's have two catalytics. I'm not sure about STi's.
 

aovsi

Supporting Member
1,948
8
Sep 30, 2002
Chicago, Illinois
I guess I neglected to say it's a 14b with 3" exhaust. Two cats would probably provide me with enough restriction to ease lots of the creep.

I know it may retarded to a certain degree, but hey, it should work. No?
 

25psi

Proven Member
475
0
Nov 11, 2002
Venice, Florida
Originally posted by f4st
why
My dads truck has the same motor(4.6) and it has four cats to....one precat and cat for each bank of cylinders.
 

bwhite

Proven Member
1,039
2
Mar 5, 2002
Brook Park, Ohio
My 93 mustang had 4 cats also, 2 for each side. But they worked to varying degrees. I dont believe putting two cats inline will accomplish the same thing. I installed an aftermarket high flow cat from bushur on my Laser and had to have it e-checked and it passed with no problem. Just make sure your car is good and warmed up. Dont go to the emissions center with a cold car. Your car needs to be up to temp so all the systems are functional. Having two cats in my opinion is a waste of money and wont buy you anything.
 

supergoat

Proven Member
1,035
1
Jul 29, 2002
West_Columbia_SC
I had a 96 Mustang GT. SIX cats. 3 on each bank. I still have that stock h-pipe with them on it sitting outside, everytime I look at it I cringe. My old RX-7 had 3.
 

TurboDropTop

Proven Member
269
0
Oct 30, 2003
Kent, Ohio
Buddy of mine has a '95 mustang GT, i wanna say it has 4 cats
 

Omega

Proven Member
1,559
10
Oct 10, 2002
Randolph, New_Jersey
LS1's have 4 cats also... or is it 3?

I lot of newer cars have 2 small ones right near the head and another 1 or 2 further back in the exhauset.

If I wouldn't just put another cat there.. get a resonator. In my car I have a cat, then a dynomax muffler, then a borla at the very end. I is still a little too loud for me so I think I am going to replace the first muffler with a resonator and the second with a dynomax muffler.
 
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