If I were to change the cat setup on my 91 Z28 from dual cats to a single cat would I fail emissions?

 

You would fail the visual check, if the tech's book says you're supposed to have dual cats and you only have one. Otherwise the emissions out the tailpipe should be the same.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Just out of curiosity, why would you want to do that? Granted, when replacing your cats, if you have two of them it is more expensive. But on the other hand, dual cats look cool, they produce more power, they probably make a little bit of a clearer sound because of the better flow, and it helps with emissions. For people that say dual cats dont help with emissions, I disagree. Maybe on a stock motor it wont matter much if you have one or two, but if you upgrade to a ZZ4 for example, then you have one cat cleaning the emissions for each side of the block. Personally, I'd keep the dual cats.

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1989 IROC-Z
350c.i. TPI
rebuilt 700R4 with shift kit
3'' Monza Pacesetter cat back exhaust (minus the muffler)[SOUNDS OF THIS ON MY WEBPAGE]
new dual cats
3.23 Posi rear
hypertech chip
under drive pulleys
adjustable fuel pressure regulator
K&N Air Filters
Excalibur alarm, keyless entry and remote start
new:
struts, shocks, bearings, distributor, cap, rotor, alternator, battery, regulator
245 ZR16 50 Tires, Rotors and brake pads all the way around

Go to my webpage to find out more about it.
You can also see pictures, and hear sounds as well.
http://go.to/iroc-z

AOL IMer: JRShotliff

 

It was just a question for future reference. I will probably just keep the dual cats though.

I have another question. How long do cats usually last? And since half the airflow will be going through each cat will dual cats last longer than a single cat?

[This message has been edited by h-town z (edited October 06, 2000).]