Hans Conser wrote:

Harley, you didn't mention which rex you have, if it is turbocharged you need to be
careful about reducing back pressure, as it will raise boost levels.

Also, the rotary exhaust is so hot that you really need a piece specifically
engineered for the application or it may last far less than a year.

Rotary Performance (http://www.rx7.com)sells "race pipes" for $160 or so.  They are
a piece that replaces all three cats with straight pipe with a presilencer (you
want the presilencer).  Illegal for street use of course.

You can also take a tire iron to your cats and hollow them out, but that is a less
elegant solution, as it is louder, more restrictive, and more prone to leakage.

You may be able to sell good used cats on partstrader.com, as they do get old and
people are looking for low $ ways of meeting emmissions.  You can tell if it is
good by looking through it, you should be able to see light through it.

It doesn't take long to melt the catalyst if your car runs way too rich, then it
will be clogged.

Hans

 
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