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Cutting out my Cats 2marrow, any tips??

This is a discussion on Cutting out my Cats 2marrow, any tips?? within the External Engine forums, part of the LSx Technical Help Section category; So tommorow I am going over to a buddys house and were planning on cutting the cats out of my ...

  1. #1
    Member camaroluvr447's Avatar
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    Cutting out my Cats 2marrow, any tips??

    So tommorow I am going over to a buddys house and were planning on cutting the cats out of my z. I have stock exhaust manifolds with a magnaflow cat back. Any input on this? is it worth it? will it throw codes? mess up air/fuel ratio? thanks guys!

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    Member 00ls-1's Avatar
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    id take them off knock the inside out or find some already knocked out and put em in place so if someone looks under or for a state inspection you wont fail right off hte bat youll gain from it but get a ses light the second sensors monitor the cats but itll just turn the light on shouldnt affect anything though

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    Senior Member 98maro's Avatar
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    So if you take all the inside of the cats is a good idea?
    Is it a real gain on power?
    Too loud?

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    Senior Member Too Fast's Avatar
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    It's a minor gain, ~5-10 HP. It will definitley turn on the SES light, the PCM will find out shortly what you've done. No, it won't mess up your A/F or other driveability, other than being louder with some added raspiness.

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    Member 00ls-1's Avatar
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    I've done it on the iroc I used to have and 97 z71 it is a power adder how much I don't know and it does get a little louder idk what you consider too loud... If u gut the cats and run straight pipe itll be real loud and be kinda poppy sounding when you get on it and sound like a truck but if you keep mufflers on it you'll be ok

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    crazy ass white boy dennis ss's Avatar
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    navy blue metallic
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    I put straight pipes in place of my cats. I had the rear O2 sensors tuned out so I don't have a check engine light. Car sounds great
    2002 Camaro SS/M6. Volant CAI, 80mm TB w/spacer, cat delete w/ ory, borla XR-1 w/ cme, custom tune, 3.73's, 8,000k HID headlights and foglights, 19" staggered ruff 278 wheels.

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    Member 00ls-1's Avatar
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    i was referring to pipe all the way back no cats no mufflers they geta lil bit poppy at certain rpms like a broken glass pack

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    Member 00ls-1's Avatar
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    nothing wrong at all with no cats im about to do lts w ory

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    crazy ass white boy dennis ss's Avatar
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    navy blue metallic
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    I'm going to do a muffler delete this weekend. Should be nice and loud with my center mount exhaust

  10. #10
    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
    Sadly now demodded :(

    See my sig for exhaust mods.

    Just deleting cats will not require a "tune" but you will need to have the rear O2 signals deleted in the PCM as it will throw an SES light. The only reason the rear O2's are there is to measure catalytic converter effeciency.
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    2002 Z28: NBM/Tan, MTI smooth lid, smooth bellows, !AIR, !cats, 1-3/4" QTP SS LT's, 2-1/2" TD's with X-pipe, MagnaFlows dumped at axle, custom welded SFC's, MidWest Chassis body mount adjustable T/A, 3400 stall, 3.23 gears (was 2.73). Tuned: 343rwhp/357rwt (before TD's). Best: 12.559 @ 108+, 1.73 60' @ 3500' DA w/MT ET Street DR's.

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    Member 00ls-1's Avatar
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    itllbe plenty loud i have no muffler and other than that still stock exhaust and its already pretty loud i just cut the muffler off right before it went into the muffler and left it that way not even a pip running to the back

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    Senior Member Too Fast's Avatar
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    ^^^25 year old driver muffler delete procedure.

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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    As others have said you'll gain a few pony's and the rear 02/s code will not effect driveability.. Engine exhaust tone will change some, and your exhaust may smell different. Some have said they noticed a little smell of gas but nothing major. Your engine will like the less restricked flow.. I'm not sure you'd be able to get a sawzall up in there on the ls1 setups tho, but it's what I used to make short work my cat when it took a shit on me..
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    Member 00ls-1's Avatar
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    Quote Originally Posted by Too Fast View Post
    ^^^25 year old driver muffler delete procedure.
    It's not the age it's the $ my xwife gets 207$ per payday plus the insurance over 500$ a month bacause it has to be family plan just for my son too damn much money... Everything else I deleted the muffler on went to the muffler shop had pipe ran to the back and had tips on it with pipe in place of the money I'm getting headers and ory on Friday and after I get that on it's goin to the muffler shop and getting redone

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    Member xmarkx's Avatar
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    Quote Originally Posted by 00ls-1 View Post
    It's not the age it's the $ my xwife gets 207$ per payday plus the insurance over 500$ a month bacause it has to be family plan just for my son too damn much money... Everything else I deleted the muffler on went to the muffler shop had pipe ran to the back and had tips on it with pipe in place of the money I'm getting headers and ory on Friday and after I get that on it's goin to the muffler shop and getting redone
    plus, when your messing around with an adj pan hard bar or your taking out your rear end youl be glad you don't have a big ass muff back there in your way

  16. #16
    Member 00ls-1's Avatar
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    Pipe in place of the muffler not money lol damn iPhone text predict

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