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Cat vs Catless

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Old 08-30-2007, 04:38 AM
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Cat vs Catless

Im thinking of ordering the ZZP header/dp combo, should i go with Cat or No Cat. Will i see a major difference from one to the other?\

Also should I do 2.5 downpipe bolt on or the 3" DP with 2.5" exit?

Im going to get the Monza 2.5 catback with the combo
Old 08-30-2007, 04:41 AM
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i've heard , if you loose your cat you loose low end TQ , just a thought !! good luck with choice
Old 08-30-2007, 04:44 AM
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I think you should look at the XTC DP...Almost $50 dollars cheaper for the same thing..

BTW, I wouldn't even bother getting a DP if it wasn't catless...
Old 08-30-2007, 04:53 AM
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would the CA header + XTC DP be cheaper then $400?

I cant look at Cobalt-addictions site at work, no Flash
Old 08-30-2007, 08:07 AM
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The CA header + XTC 2.5" de-cat downpipe is $380. ($200 for the header, $180 for the de-cat DP). Go with 2.5"......3" is overkill for our cars. Plus, I don't understand why people wanna use a 3" DP to hook up to a 2.5" cat-back......kinda pointless.
Old 08-30-2007, 08:44 AM
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hmmm...
Old 08-30-2007, 08:47 AM
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There have been dynos showing running with no cat only yeilds around 2hp.

It's not worth the raspy sound and emissions issues. I say with high flow cat.
Old 08-30-2007, 08:50 AM
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breaking in the cat is a pain,go catless
Old 08-30-2007, 08:55 AM
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Originally Posted by g5mike
breaking in the cat is a pain,go catless
Lol...a pain...Mike....come on on bro....lol

You just can't WOT your car for 250 miles. I guess that could be a pain.
Old 08-30-2007, 09:02 AM
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Originally Posted by CTCOBALTSSS
There have been dynos showing running with no cat only yeilds around 2hp.

It's not worth the raspy sound and emissions issues. I say with high flow cat.
Hey, I like my bit 'o rasp! Only raspy at WOT, deep at all other times.
Old 08-30-2007, 09:06 AM
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I'm under attack. I'm putting the suit on folks. lol

Old 08-30-2007, 09:10 AM
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...
Old 08-30-2007, 09:25 AM
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Guess it depends if you are worried about emissions issues, I believe the zzp high flow cat still sets a low efficency code. Stouffer said he has his light coming on after he got his. Guess just save your old stuff if you need to go through emissions so you can slap it back on. Think eliminating the cat all together will reduce the backpressure too much and actually hurt performance more then it would gain.
Old 08-30-2007, 09:26 AM
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Cat-less...... I hate cats. They're sneaky lil buggers that lay in wait until you pass by with a bowl of cereal....then BAM!!! they tackle your feet and you're fruit loops go flying.



I can help you out with the catless code issue anyway. If you're gonna pimp my services, you better partake

Last edited by WickedSS2005; 08-30-2007 at 11:08 AM.
Old 08-30-2007, 09:28 AM
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Originally Posted by WickedSS2005
Cat-less...... I hate cats. They're sneaky lil buggers that lay in wait until you pass by with a bowl of cereal....then BAM!!! they tackle your feet and you're fruit loops go flying.

I can help you out with the catless issue anyway. If you're gonna pimp my services, you better partake
^^^^ ha lol ha that is funny as hell
Old 08-30-2007, 09:29 AM
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Leave the cat on. Helps with emissions and all that jazz. Won't have to keep putting it back on and taking it off. Just get a high flow.
Old 08-30-2007, 09:33 AM
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Keep the cat. I've done it to 4, 6 and 8 cylinder cars and trucks and will never do it again. Why? You lose that low end torque and if you are racing, you will notice it. Any that raspy sound will qualify your car as rice, especially if you have a 6 inch fart can. Keep your exhaust quiet and high flowing. I personally like the exhaust quiet so I can 1) listen to the radio and 2) listen for any abnormal sounds the car would make while driving. But hell, to each their own.
Old 08-30-2007, 11:11 AM
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Originally Posted by Brucesblack
^^^^ ha lol ha that is funny as hell
Thank you. Best part, true story from last weekend when I visited my parents.
Old 08-30-2007, 11:13 AM
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i got the 2.5 zzp downpipe gonna get installed next week
Old 08-30-2007, 11:17 AM
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Im not worried about emissions, OH did away with e-check/inspections... Its more of a noise thing then anything, if having the cat will keep it a little quieter without hurting performance id like to use the cat anyways.
Old 08-30-2007, 01:03 PM
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Originally Posted by REIGNftSOLDIER
Im not worried about emissions, OH did away with e-check/inspections... Its more of a noise thing then anything, if having the cat will keep it a little quieter without hurting performance id like to use the cat anyways.
Sweet, also go with the 2.5
Old 08-30-2007, 01:25 PM
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Still, keep the cat on. Its helpin' your low end...and its emission's friendly.
Old 09-08-2007, 01:26 PM
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I have 2.5 as well with the Magnaflow cat. Who says you can't WOT for 250 miles?
Old 09-08-2007, 03:03 PM
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I just bought my catless dp for $100 shipped. Keep your eye open on the forum.
Old 09-08-2007, 04:08 PM
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Catless and full 3" if you plan on making close to 300hp.....


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