Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

  1. JimmyJuneau

    JimmyJuneau 1/2 ton status

    Joined:
    Apr 11, 2001
    Posts:
    811
    Likes Received:
    0
    Location:
    Juneau, Alaska
    I live in Alaska and we dont have any smog testing here although I might be moving back to WA and they do smog testing. Can I take my stock cat off an put a piece of regular pipe in its place for now and keep the old cat incaase I move back to WA? Im assuming the cat will need to be taken off with a torch. How much power does this free up is the exhaust louder?



    1985 GMC JIMMY
     
  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

    Joined:
    Feb 17, 2000
    Posts:
    15,552
    Likes Received:
    136
    Location:
    Cochrane, Alberta, Canada
    Just like you said- cut the old cat out and weld or clamp a new piece of pipe in it's place. My 84 305 has no cat- I did notice a little bit more pep with it off. As far added exhaust noise, all you'll hear is a little bit more roar when you step on it. My exhaust volume didn't change at idle.

    Throw the factory cat in the garbage. If you have to replace it when you move, buy a new high-flow cat.



    <font color=red>PHOTO ALBUM-</font color=red> <a target="_blank" href=http://albums.photopoint.com/j/AlbumList?u=1289798>http://albums.photopoint.com/j/AlbumList?u=1289798</a>.......<font color=blue>TRUCK & HIKING PICS</font color=blue>
     
  3. solowookie

    solowookie 1/2 ton status

    Joined:
    Mar 31, 2001
    Posts:
    3,880
    Likes Received:
    0
    Location:
    Wyoming
    you'd have to find a shop that would take it off (ill-legal to for a shop to take it off in most states), but we have the same situation here...

    I took the cats off of 'Isane Ewok', and it will be taken off of 'Jedi Mind Trick' shortly...

    <font color=blue> Jeff - may the force be with you</font color=blue>
     
  4. JimmyJuneau

    JimmyJuneau 1/2 ton status

    Joined:
    Apr 11, 2001
    Posts:
    811
    Likes Received:
    0
    Location:
    Juneau, Alaska
    I already have an exhaust guy that will take it off for me but if it doenst make much difference in power why take it off then ? Does it helo with gas mileage?

    1985 GMC JIMMY
     
  5. solowookie

    solowookie 1/2 ton status

    Joined:
    Mar 31, 2001
    Posts:
    3,880
    Likes Received:
    0
    Location:
    Wyoming
    well you gotta figure it can definately help the thing breather better...

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>http://coloradok5.com/gallery/Jeffs-Stuff</a>
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,979
    Likes Received:
    189
    Location:
    Roy WA
    As old as it is, its probably pretty ineffective. They are not lifetime parts. However, a properly operating cat is no more restrictive than the stock single exhaust setup itself, so no, its not worth taking off to free up a couple of HP. Again, thats IF it is not broken up and restricting exhaust. I can tell you right now, you MAY have a real hard time getting anyone in WA to put a cat BACK on your truck. I know how paranoid they are, I am going to have to get a friend to put duals on my car, after calling about 10 shops, even tellingthem it was "off-road only" Obviously wanting to install a cat is not the same thing, but with the laws being the way they are, and most shops not knowing if your truck is SUPPOSED to have a cat, they may not want to touch it. WE know it is supposed to have a cat, but they won't. Another idea is if someone will cut it off for you up there, have duals from manifolds back installed, and put TWO cats on the vehicle. Again, not legal, but it will help you pass smog easier, your engine will breathe better, and with no visual here, they can't say anything about two cats.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  7. muddin4fun

    muddin4fun 3/4 ton status

    Joined:
    Feb 19, 2001
    Posts:
    5,644
    Likes Received:
    0
    Location:
    N Texas
    It depends on what kinda shap your cat is in presently. Taking the cat off the camaro helped a bunch with gas milage, power, etc..
    On my '86 pickup when I took the cat off...it helped, but not as much as on the camaro. Every truck or car is different.

    No prohibiting allowed!!!!

    <a target="_blank" href=http://www.geocities.com/muddin4fun79blazer/>http://www.geocities.com/muddin4fun79blazer/</a>
     

Share This Page