So I'm thinking about going with the Bšnez Performance Full Cat Replacement Kit.

Would this require ant other modification to keep the boost or fuel ok?

http://www.rx7.com/cgi-local/3catalog.cgi?cat=4&part=1

 

Do you have the stock intake airbox, and IC? If so, then the sock ECU will hold up. If you opened up the intake then you are sitting at the boarder line of ECU upgrade, add an IC then definitely.
It really depends on what you currently have on your 7.

 

Getting these types of mods are great for the FD. It will let the car breathe better, less restrictive, and the temp for the car will drop. Also, if you have some boost problems this might solve your problem. If your car is stock right now you will not have any problems with the boost and fuel.

Also, you do not need an ic if you are running less than 12.5 psi.

 

Thanks guys.

Sorry I should have said that the car is stock.
I had hoped to keep it as such but if I need a new cat there is no way I'm paying $1500 for a Mazda part. The precat is $1300 by the way.

Just trying to prepare for the possibilites.