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Cats or no Cats

This is a discussion on Cats or no Cats within the External Engine forums, part of the LSx Technical Help Section category; I am probably going to have pacesetter LT's bolted up to my car and i was just trying to figure ...

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    Senior Member ss~zoso~ss's Avatar
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    Cats or no Cats

    I am probably going to have pacesetter LT's bolted up to my car and i was just trying to figure out wether i'm going to have a catted Y or non catted Y.

    can someone tell me the differences / bennefits to each, will my car be really loud with the LT's and a flowmaster and would cats make it sound a little less raspy?

    how much HP would i loose with cats, and if i got the o2 sims would that hinder my engine's performance or calibration?
    98' SS Convertible Camaro-76k-Build # 1471, Cragar SS rims, RK SFC's, MAC Panhard, LSX Tune, Shaner S3,
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    Grand Imperial Wizard Sarge's Avatar
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    Well we are into "perception" lil buddy....what is loud to one fella may be a kitty purring to another.....yes you will get a lower tone without cats...more bass so to speak....and some report smelling like gas when they crawl out of the car with no cats...minimum power gains....most end up going catless for one of two reasons....
    1. Your mods/tune burns them up. That would be me....so I took a broom handle and gutted the SOB's....I got cats...but nothing in them....so I pass inspection ( we dont have emmisions here in my county)...got a deeper rumble with them gutted and I smell like Irish Spring when I fall out of the car....
    2. Folks want a loud ass car.
    I deleted the rear O2's in the program....or you can just get the rear simms and be done with em and throw no codes without the cats...up to you....as for the loudness....mine with SW LT headers/Y/gutted cats/DynoMax Thunder Tubes and Borla exhaust are "loud" but non intrusive except at WOT...then children cry and old ladies shit themselves.....at highway cruising there is a slight drone but nothing AC/DC cant take care of on the stereo....

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    Senior Member ss~zoso~ss's Avatar
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    thanks man, by the way i like your avatar

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    Senior Member Street Lethal's Avatar
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    Quote Originally Posted by ss~zoso~ss
    will my car be really loud with the LT's and a flowmaster...
    Much like Sarge stated, it highly depends on the listener. I myself literally live at the track, so the above combo would sound pretty tame, from my perspective...

    Quote Originally Posted by Sarge
    got a deeper rumble with them gutted and I smell like Irish Spring when I fall out of the car...

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    Senior Member ss~zoso~ss's Avatar
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    do you think i'd still gain like 20 RWHP with cats and LT's?

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    I heard that flowmaster is raspy with long tubes. You will gain a couple hp by switching mufflers.

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    Senior Member Street Lethal's Avatar
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    Quote Originally Posted by ss~zoso~ss
    do you think i'd still gain like 20 RWHP with cats and LT's?
    You're going to gain a considerable amount of power with the addition of long tube headers, 'regardless' if you go the catalytic converter route or not. With the amount of L98's and LT1's, in which we removed the smog pump, disabled/blocked off the EGR, and gutted the cat, while still running the same numbers at the track afterward (albeit, with a different exhaust note, and more SOTP feeling), I'd recommend simply staying catted for a daily driver.
    Last edited by Street Lethal; 02-26-2006 at 09:51 AM.

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    Senior Member ss~zoso~ss's Avatar
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    what is a decent price for highflow cats, for a pair

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    Member SKULLZ's Avatar
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    random tech cats are about $300 a pair

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    Grand Imperial Wizard Sarge's Avatar
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    Yup^^^
    I always recommend to the young guns around here to go with cats first....even though they do absolutely nothing until they reach like 700* and of course 99% of your cars polution is done when cold...so your car warms up and you are putting out zilch for polution and your cats start to work...makes sense to me...If I was a IDIOT...Oh well...rant/
    This is my signature. It is mine. Nobody else has one like it.

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    Sideways to da next light redline's Avatar
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    that is exactly why i pulled my cats off, Flashed the computer, and ran a stainless steel y pipe to a dump before the axel. Then installed the loudest kenwood system i could find so i could succesfully break any noise laws that may be in effect. killed two birds with one stone

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    Grand Imperial Wizard Sarge's Avatar
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    God loves them Okies

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    Senior Member Street Lethal's Avatar
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    Quote Originally Posted by Sarge
    so your car warms up and you are putting out zilch for polution and your cats start to work...makes sense to me...If I was a IDIOT...Oh well...rant/
    This is true. I too enjoy waiting for the newbies' feet to get wet, then fill them in on how the 'environmental pollution act' (EPA) is nothing more than a big scam. They cost vendors millions in just getting their products approved. I rank them right next to the federal reserve...

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    Senior Member ss~zoso~ss's Avatar
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    who u callin a newbie

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    I will be ordering a set of kooks to day and y pipe catless. I now have a Loudmouth and read hear it will be to loud. I like it loud but not call the cops loud. SLP makes a kit to turn the loudmouth in to a loudmouth 2. ? will the loudmouth 2 be better.
    Is this kit any good. Other ideas.
    99ss m6
    Last edited by skar; 02-27-2006 at 04:49 AM.

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    Senior Member ss~zoso~ss's Avatar
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    it will be a little less raspy and a little quieter

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    Quote Originally Posted by ss~zoso~ss
    what is a decent price for highflow cats, for a pair
    Magnaflow cats are some of the best, and can be had for around $50 each on ebay.

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    Sideways to da next light redline's Avatar
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    and its a good thing god loves crazy old bastards or else we'd both be racing the devil on the highway to hell!!!:firedevil :firedevil

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    Quote Originally Posted by skar
    I will be ordering a set of kooks to day and y pipe catless. I now have a Loudmouth and read hear it will be to loud. I like it loud but not call the cops loud. SLP makes a kit to turn the loudmouth in to a loudmouth 2. ? will the loudmouth 2 be better.
    Is this kit any good. Other ideas.
    99ss m6
    I've got a video of mine, headers catless y and loudmouth if you wanna hear what you're in for

    -which happens to be loud. . .not incredibly loud for tame driving, but it is easily call the cops loud at WOT.

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    Quote Originally Posted by z_driver1
    I've got a video of mine, headers catless y and loudmouth if you wanna hear what you're in for

    -which happens to be loud. . .not incredibly loud for tame driving, but it is easily call the cops loud at WOT.
    Sure if it is handy for you.

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