Does anybody know for certain if a factory GM 1995 Z28 catalytic converter with head pipe is the same as a 1994 catalytic converter. They seem to have different part numbers. Trying to find a replacement GM catalytic converter but only can find one for a 1995. Thanks!

 

The GM parts book has 93-95s with single converter the same part number (export is a different number).

 

If the 95 is a CA emissions model (RPO "YF5"), and it has an A4 transmission, it will be dual cats, similar to the 96/97 49-state dual-cat system. The 94 CA emissions A4 did not have dual cats.

 

Thank you both for the fast reply! Can you tell me what the part number is? Are there any other options that I should look at. I have a 94 with single cayalyst. Trying to locate a new oem catalytic converter. Thanks again!

 

Manual or auto trans?

I bought my 94 Formula in CA, and the 1994 M6's were all 50-state certified, no CA emissions add-on.

Can't you use an aftermarket cat, as long as it is CARB certified for your year/engine/trans car?

 

Automatic. Was originally a 49 state car, in CA now.Thank you.

 

The GM part is discontinued. You'll have to go aftermarket.

 

Might stop by R@G brake and wheel on creekside.See Rick the owner.He knows these cars real good.He also owns the exhaust shop next door.His dad had a F-body.He is behind the post office with all the car repair places there.His prices are fair and he is always dead on with any repair.Also the dent removal place down a couple of doors is a God send.Hope this helps.Tell him Jim sent you with the red camaro z28(furniture salesman at Simply discount).

 

Sorry I had to come back in here but d id you fail smog or something and you need a new cat?How miles on the car? Sometimes it might be the 02 sensors going south.Hope this helps.

 

There are no after-cat O2 sensors on a 94. The PCM has no way to monitor cat activity.

 

Thank you everyone for all the answers and suggestions! I have had to replace the aftermarket catalytic converter every couple of years and was hoping to find a new oe catalyst. Got a new Walker cat and passed smog test today. Thanks again.