Hi all

I have searched my butt off trying to find what company has the highest flowing large cat convertor but I am lost

Some claim to legal and others claim that the "other manufacturers" one is illegal and race only and wouldnt pass emissions.

Well this is for a race appliccation but I do still need a cat in the class of racing so what is the highest flowing one for race use?

But with all these figures plucked from the air, I dont know who to beleive?

Everyone seems to claim they have the highest flowing cats. NONE seem to have proper test reports on flow though.

Since the exhaust is 4 inch, I really need a 4 inch inlet and outlet so maybe a 5 inch body?

I have found a few of these but I just dont know what flows the best as the figures I have found are far from accurate.

I know the 100 CPSI flow the best compared to 200 or 300 but what else?

From what I have read, I will need a metal one as it handles higher heat and rich air/fuel ratios compared to ceramic and flows a little more.

Also the round barrel ones are supposed to flow more?

Can you get a Cat that flows almost as good as no cat?

I have seen tests on stock cat vs OBD1 vs OBD2 (different level of emmissions standard) vs straight thru pipe but the tests were on a NA civic!

Gains were within a few HP only but I am assuming this would not be the case if it was a very powerful behicle with more then 147hp at the wheels lol..

Any real life tests or experience would be great

A few people have said SMB here:
http://www.smb.net.au/catalyticconverters.htm

Others have said Metal Cat
http://www.metalcat.com.au/

I dont mind if I have to order from overseas (I am in Australia)

Thanks
PRD

 

Bonez seems to be the popular one among the FD guys.
http://www.rx7.com/store/rx7/fdexhaust.html

 

I hung one from these guys on a ported FC years ago, worked out fine.
http://www.randomtechnology.com/