C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Hi Flow Cat recommendation

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Old Nov 16, 2004 | 08:29 AM
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Default Hi Flow Cat recommendation

With all that I am doing I have decided to replace the Cat when I redo the exhaust and I am looking for some recommendations. I have seen what MadVet, Ecklers etc have to offer are there others that I should consider?
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Old Nov 16, 2004 | 08:54 AM
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Originally Posted by elkabong
With all that I am doing I have decided to replace the Cat when I redo the exhaust and I am looking for some recommendations. I have seen what MadVet, Ecklers etc have to offer are there others that I should consider?

random tech
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Old Nov 16, 2004 | 09:15 AM
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why not save the money and just gut the existing cat?
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Old Nov 16, 2004 | 10:14 AM
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Originally Posted by Orlando85UCFvette
why not save the money and just gut the existing cat?
Because he's in Arizona and would probably never pass our strict emissions test.
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Old Nov 16, 2004 | 10:20 AM
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Originally Posted by 88BlackZ-51
random tech
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Old Nov 16, 2004 | 10:22 AM
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whoops....didn't realize AZ had inspections...FL did too until the stopped them because it cost the gov't too much and they weren't seeing a difference....
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Old Nov 16, 2004 | 11:01 AM
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I've been cat-less for two years now. Don't have to worry about emissions here in Alabama. However, I'm probably going to put some high flow cats on the car pretty soon.

My car smells like a school bus.
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Old Nov 16, 2004 | 11:05 AM
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Originally Posted by HammerDown
I've been cat-less for two years now. Don't have to worry about emissions here in Alabama. However, I'm probably going to put some high flow cats on the car pretty soon.

My car smells like a school bus.
Better than "rotten egg" smell.
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Old Nov 16, 2004 | 11:39 AM
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Originally Posted by 88BlackZ-51
random tech
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Old Nov 16, 2004 | 11:42 AM
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AZ has emissions. I have thought about just gutting the existing cat but with new heads/cam/headers etc I need to make sure it will pass. I will check out random cat. Thanks.
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Old Nov 16, 2004 | 11:48 AM
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I have Random Tech cats as well - bought them through Exotic Muscle in Tempe. Give 'em a call.
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Old Nov 16, 2004 | 01:09 PM
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Hold on...I live in Az as well and I gutted my cats. Am I going to have a problem come emission time? Second, does a AZ vett hold up to emissions if the car has LT headers and say random tech cats?
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Old Nov 16, 2004 | 01:27 PM
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If your car is a 1996 or newer, they just plug into the OBD. Otherwise, your car is put on the rollers (IM240?). Mine's a '93 with LT headers and RT cats. I'm hoping that it will pass (it should).
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Old Nov 16, 2004 | 02:10 PM
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With no pre-cats, a RT 3-stage main cat and TPIS cat-back my '88 L98 easily passes the E-check testing in OH while running a 160deg F t-stat in the middle of Feb.

This OH dyno emissions test is very similar to the testing that was done in Mesa, AZ, where I had the car first licensed 4yrs ago.

OH does a visual under the car to see if it has a cat but, other than being on the dyno sniffer, I can't recall the total procedure in Mesa, AZ.
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Old Nov 16, 2004 | 11:16 PM
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Ooopppsss. Sorry I have a 84 - just one cat.
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Old Nov 17, 2004 | 01:03 AM
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i was gonna say ELK i'd sell you my magna-flow cat cheap but if theres strick laws in arizona like cali im gonna hate to move there next year! i thought i was gonna have more freedom dammit! at least you can buy and keep on smog legal headers as opposed to NO headers for L83/L98's here in CA.
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Old Nov 17, 2004 | 09:15 AM
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Long tubes are perfectly legal in AZ. Moving from California to AZ is like moving from Cuba to Miami. We are a RED state and don't have 1/10 of the stupid anti-constitutional laws like CA. Move over and buy all the guns you want.
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Old Nov 17, 2004 | 12:10 PM
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Normally I would agree with every part of that statment, but lately I've been having second thoughts about the emissions testing. As strict as in Kalifornia? No. But when you sit behind some of the wretched excuses for "vehicles" that we have all over the roads in Alabama, and you just about pass out from all the noxious fumes and black smoke that are pouring out of their rusted busted tailpipes, it kinda makes you wonder what kinda damage we're actually doing to ourselves and our surroundings.
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Old Nov 17, 2004 | 01:08 PM
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Hammerdown, I agree with you. That's why I'm against removing or gutting the cats for street use. emissions testing here is pretty strict, but at least we can use longtube headers.
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Old Nov 17, 2004 | 01:42 PM
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hammer: i dunno how it is in cali, but when there was emission testing in florida, you still saw cars that burned more oil than gas. i wondered how a car could pass the testing. it just seemed like a restiction on people that were driving good cars any way. it certainly didn't seem to affect people who were driving rusted beaters around.
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