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simply cutting of cats? worth it?

This is a discussion on simply cutting of cats? worth it? within the External Engine forums, part of the LSx Technical Help Section category; instead of lts, what would happen if I just cut the cats after the manifold and ran a pipe instead ...

  1. #1
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    simply cutting of cats? worth it?

    instead of lts, what would happen if I just cut the cats after the manifold and ran a pipe instead of cats? will my car still be loud? cause i might not be able to get lts yet

  2. #2
    no more 4th gen secondgearscratch's Avatar
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    what do you mean instead of longtubes? cats have nothing to do with longtubes man. cats are there for emissions and really have no other uses than being a pain in the ass.

    if you arent going to get headers yet look at getting an off road y pipe which is catless and will save you the trouble youre getting into. yes the car will still be loud. i assume you have a catback exhaust already?

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    cats

    i cut my cats off today and i noticed a power increase and it sounds awesome

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    Member jag42420's Avatar
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    I think I remember a dyno posted somewhere that claimed cat removal was worth 7HP...

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    cats

    i would think more than that, they claim an off road pipe can give up to 20 hp and bassically cutting the cats off is a off road pipe, but i didnt notice free reveing, more power since i done mine

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    member kwade's Avatar
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    Do you have to deleate them to do this? I mean the codes in the computer for the cats,deleate them with a performance program?I'm interrested in doing mine too.

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    Member jag42420's Avatar
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    You have to delete the rear o2s in the computer, use sims, or trick them like this: http://www.srtforums.com/forums/showthread.php?t=93604 .

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    o2 codes

    i have a diablo and i deleted the o2 codes from mine no codes yet

  9. #9
    Moderator Firebirdjones's Avatar
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    If you plan on getting long tubes sometime in the future it wouldn't be worthwhile to invest in a (manifold) style off road Y-pipe,,,thats $200 down the tubes you could have put towards headers.

    I can tell you from my own experience,,,I have removed my cats,,,what I did is purchase another used pair that were already gutted. I didn't want to gut mine since they were both recently replaced under warranty.

    Anyway I plan on headers and off road Y-pipe in the future so I didn't want to invest too much money in this experiment. Here is what I have found.

    It changed my LTFT's quite a bit,,,computer was adding more fuel so I had to adjust for that (using HPtuners) I also of course had to delete the rear 02's but thats not a big deal.

    The car was only very slightly louder than before. Still using the stock manifolds,,,and mine has the optional CME exhaust from SLP so it's really not loud anyway.

    At the track the car ran the same ET's and MPH's,,,no performance improvement from what I have found so far.
    Next are headers and Y-pipe and back to the track. Hope that helps.

  10. #10
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    cost

    it only costed me 30 dollars to have my cats deleted and pipe welded in, of course i have to cut them off myself muffler shops wont do it

  11. #11
    Member raysz28's Avatar
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    any tips on cutting out and replacing the cats with pipe?

    98 Ticket Red Z28
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    Member TedsB4Csled's Avatar
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    Quote Originally Posted by kyemt View Post
    it only costed me 30 dollars to have my cats deleted and pipe welded in, of course i have to cut them off myself muffler shops wont do it
    Where did you get it done for $30? I'd like to have mine deleted. I have a Hypertech but doesn't have that option. Darn!

  13. #13
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    how do you delete the rear 02s? if i just gut them and put them back on, will it still throw a code?

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    Member TedsB4Csled's Avatar
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    Quote Originally Posted by kebie05 View Post
    how do you delete the rear 02s? if i just gut them and put them back on, will it still throw a code?
    You gut the cats and then use o2 sims or have them deleted/tuned out. Just try mechanical O2 simulators. I have 2 here if you want for a few $$$. Where r u located?

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    ME!!
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    i am in prattville alabama. is it something i can do with a diablo handheld tuner?

  16. #16
    Member TedsB4Csled's Avatar
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    Quote Originally Posted by kebie05 View Post
    i am in prattville alabama. is it something i can do with a diablo handheld tuner?
    Yes, Diablo Predator(?) is capable of !O2s. Never used that hand held so I wouldn't know how.

  17. #17
    old timer blue02Z's Avatar
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    why delete your cats?? all they do is clean up the air. i plan on getting high flow cats when i get home to texas in a few weeks. they dont hold your hp back as far as everyone thinks and they arent a bad thing

  18. #18
    The Red Reaper 98Z28importslayer's Avatar
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    cats are pointless if your looking for performence ... all they do is restrict airflow, so if you dont have to worry about emission just cut them out and weld in a pipe or buy a 3" ORY from pacesetter for $120

  19. #19
    LTX N20LT4's Avatar
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    Quote Originally Posted by 98Z28importslayer View Post
    cats are pointless if your looking for performence ... all they do is restrict airflow, so if you dont have to worry about emission just cut them out and weld in a pipe or buy a 3" ORY from pacesetter for $120
    The alternative to that is high-flow cats. I use a Random Technology cat that flows very well. I figured I had to do my part somehow on conserving our enviorment

  20. #20
    The Red Reaper 98Z28importslayer's Avatar
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    Quote Originally Posted by N20LT4 View Post
    The alternative to that is high-flow cats. I use a Random Technology cat that flows very well. I figured I had to do my part somehow on conserving our enviorment
    lol i just leave the conserving the enviorment parts to the tree huggers that drive the little 50 mpg honda's they make it up for me but i think removing the cats or cat is a good way to get some extra ponies.

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