Which CPSI cat to use?

[93Leg-c]

I'm planning on obtaining a metallic substrate catalytic converter to hook it up to my Bosal (uncatted) downpipe. I want a high-flowing exhaust but I don't want the exhaust to smell; I want it like the OEM system. Does anyone know which CPSI (cells per square inch) metallic cat I need to use -- 200, 300, 400, or more? If I need to go 400 CPSI or higher, would it be better to use two lower-CPSI cats instead of one higher-CPSI cat? I tried searching for the answer but haven't found it.

Thanks for any help you can give.

[Legacy777]

That may be something you might want to ask the manufacturer of the cat. I'm not sure what the stock cat setup is like.

[93Leg-c]

Good idea. Thanks Josh!

[Josh222]

I used a magnaflow 59959 on my car. I am not sure what the cpsi is on that cat but I don't get any smell and passed the e-test I just did with flying colors.

passed the e-test with just that cat and my car has deltacams on the stock ecu.

2500rpms
HC PPM Limit 200 Read 18
CO% Limit 1% Read 0.01%

Idle
HC PPM Limit 200 Read 125
CO% Limit 1% Read 0.01%






The Cat...
http://www.magnaflow.com/02catalytic_co ... rsal=59959

[93Leg-c]

Josh222, thanks for that info and pics! Research shows the 59959 is 200 cpsi. It's good to know it doesn't produce a smell.

BTW, did you weld in the bungs and the cat yourself or did someone else do it? If someone else did, I'm just wondering about how much it cost?

Thanks!

[Josh222]

I did that myself at work so I am not sure how much a shop would charge for that. Up next is replacing my Blitz Nur Spec catback with something a little quieter and subtle Blitz Nur is neither quiet nor subtle