I failed emissions recently, so i'm going to replace my cat. I was going to order a catco but I saw an old post that said they sucked for emissions.

 

Beats me... a cat is a cat... there is kinda only one way to build them... as long as it's called a catalytic converter, it'll work.

To answer your question better... a few people here are passing Cali emmisions with them right now.

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1985 Camaro SC - 2.8L, auto.

http://www.xenodrgn.f2s.com/Frontright.jpg

 

I have a Catco and I passed emissions with flying colors. Random Tech is really nice but kinda pricey. And a cat is not a cat in my eyes but I am sure some people will tell me differently. But some cats flow better than others and restrict the exhaust less than others.

 

I had two new Catco cats put on my car a couple of weeks ago and then the next week I had my car smogged and it passed easily.At idle my reading was 37 the max allowed is 120 and at 2500 rpm my reading was 13 and max allowed is 140.

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SLP 1 5/8 Headers,Dual Catco cats,ATR catback exhaust,SLP cold air box,Crane 1:6 roller rockers,Bosch plugs and MSD wires,MSD Coil,Fastchip,Underdrive pulleys,Borg Warner 9 bolt 3:27,Corvette Servo,ROH ZS 17X9.5 Goodyear GSC,s 275/40/17

 

I passed Cali emissions with a Catco.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

 

I passed e-check with a Catco and no smog equipment

 

Hot Rod ran a test a while back with a different catalytic converters and who had the best ones? GM. The stock catalytic converters are the best at cleaning the exhaust. They are also the most restrictive. So go with an after-market cat and hope for the best. If you flunk just add another aftermarket cat.

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84 Z28 383
Stripped w/Cage back halved w/ladder bars and coil overs and 9 inch
700R-4 3.73

 

I failed illinios emmitions with a gutted cat, so I had a Walker hi flow put on. It was fairly cheap, sounds great (as loud as gutted), and the engine runs smoother. I passed with flying colors after the cat was put on.
Good Luck!!