Hi all,

I am dealing with Texas emmissions and looking to see if there is a way for me to pass the sniffer test. Car is a 95 z28 that has been down and out for a few years and was recently rebuilt with LE2 heads and a 226/230 cam. Car has long tube headers, OYRP and Borla catback.

Is it possible to pass the sniffer with this cam and 2 quality cats?

I was thinking about fabbing up two of these to the y-pipe:

http://www.summitracing.com/parts/MPE-59959/

I was told the metallic substrate is superior to the ceramic. Would this do the trick or would I need to spend more money on the california cats?

Thanks in advance!

 

With a really good tune, you should be able to pass the sniffer. Back when Missouri had emissions testing for pre-OBDII cars I passed with ported heads, 224/230 605/622 112+2 cam, long tubes and Dynatech PowerCats.

What is the LSA of your camshaft? If it is tighter than 112 that could cause a problem.

 

LSA is seperation right?

My cam sheet says 111.

 

With a good tune and those cats I'm pretty sure you can pass the sniffer. Any visual checks?

 

I talked at length with the tech, he said he just needed there to be 1 cats on each bank of the exhaust since I added long tube headers. I'll have to chop up my y-pipe but it will be worth it imo.